270 constructs from 48 papers

Every idea these papers name

A construct is a thing a paper defines so it can measure it. This is every one of them across the corpus, alphabetical, each with the paper’s own defining sentence. It is the fastest way to find out whether an idea you care about has already been operationalised — and by whom.

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“Nerdy” personality system prompt

The actual instruction text OpenAI used to make ChatGPT's optional 'Nerdy' persona sound playful and irreverent, which turned out to be the setting where goblin/gremlin language concentrated.

The paper’s own definition
“You must undercut pretension through playful use of language. The world is complex and strange, and its strangeness must be acknowledged, analyzed, and enjoyed. Tackle weighty subjects without falling into the trap of self-seriousness.”Solving the goblin mystery
Where the goblins came from →

1% false positive rate (FPR) calibration

A monitor's alert threshold is set so it only wrongly flags 1 in every 100 harmless transcripts, then its catch rate on real attacks is measured at that setting.

The paper’s own definition
“We calibrate our monitors to a 1% false positive rate, meaning they would only incorrectly flag 1 in 100 benign transcripts, and measure how many real attacks they catch at that threshold.”Evaluating monitors
SLEIGHT-Bench: Finding Blind Spots in AI Monitors →

A

abstention rule

A built-in refusal to make a prediction when too few similar historical models exist to trust the resulting estimate.

The paper’s own definition
“the framework uses an abstention rule: it abstains from estimation if the target’s cluster contains fewer than three models, as sparse clusters indicate a lack of sufficient source data to form an informative prior.”§2.2.3 Selecting source data
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Abstraction Barrier

The worry that because today's AI learns by absorbing human-generated data, it may never invent genuinely new concepts on its own the way Einstein invented relativity.

The paper’s own definition
“The hypothesis that AI systems trained on human abstractions and concepts lack the ability to discover novel concepts from raw data.”Appendix B, Glossary
From AGI to ASI →

Access control (capability-level)

Letting different users get different specific capabilities from the same underlying model, rather than an all-or-nothing choice between model versions.

The paper’s own definition
“An alternative approach is access control  at the level of individual capabilities. For example, a deployment that includes advanced virology knowledge for a vetted biosecurity lab and excludes it everywhere else, with general performance unchanged in both cases.”Introduction
Modular Pretraining Enables Access Control →

ACCoRD (Assessment of Consistency in Conceptual Reasoning Domains)

Tests whether a model's own stated probabilities and preferences contradict each other, as a proxy for trustworthy reasoning.

The paper’s own definition
“ACCoRD (Assessment of Consistency in Conceptual Reasoning Domains) measures the extent to which models' reported beliefs and preferences on conceptual issues are logically consistent.”Our benchmarks > ACCoRD
Introducing the Conceptual Reasoning Index →

Activation oracle (AO)

A tool you can ask free-form questions about what's happening inside the model at a given moment.

The paper’s own definition
“Activation oracles (AOs): models trained to answer arbitrary natural-language questions about activations.”Interpretability tools provide no uplift on our evaluation
Would This Change Your Answer? Evaluating Explanations of LLM Beha… →

Activation oracle (AO)

A model fine-tuned to answer a specific, researcher-chosen question about what an activation encodes, rather than producing an open-ended summary.

The paper’s own definition
“We test this by fine-tuning AVs into question-answering activation oracles (AOs): models that answer targeted, researcher-provided questions about an activation, such as "What language is this text in?" or "Is the model aware it is being evaluated?"”Using NLAs for supervised activation oracle training
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Activation reconstructor (AR)

The half of the NLA that reads the AV's text description and tries to rebuild the original activation from it.

The paper’s own definition
“The AR converts these explanations back to activations.”Introduction
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Activation verbalizer (AV)

The half of the NLA that reads an activation and writes a natural-language description of it.

The paper’s own definition
“The AV maps activations to text descriptions, which we call explanations .”Introduction
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Adversarial elicitation

Testing whether an attacker can bring back a supposedly removed capability just by fine-tuning the model on related data.

The paper’s own definition
“We then test whether the removal survives “adversarial elicitation” from an adversary fine-tuning on malicious data.”Access Control on Real Dual Use Data
Modular Pretraining Enables Access Control →

affinity

How tightly a designed protein grips its target; tighter grip generally means a more effective, lower-dose drug.

The paper’s own definition
“Affinity is a measure of how strongly a protein binds to its target; high-affinity binders are generally needed to achieve a therapeutic effect because they make the drug effective at lower doses, reducing the risk of side effects and the cost to manufacture them.”Claude designs proteins
How Claude is accelerating protein design and analytical chemistry →

Agentic AI

AI that can take multi-step actions on a person's behalf, not just answer questions.

The paper’s own definition
“Generative AI systems increasingly differ in the extent to which they can act on a user’s behalf, or in other words, the extent to which they are agentic.”Introduction
Research acceleration: The view inside OpenAI →

Agentic misalignment

The model acts on its own goal instead of the user's or operator's instructions.

The paper’s own definition
“In agentic misalignment , the model pursues its own motivation against a user’s instructions, such as protecting another model, shaping an evaluation, or steering a human coworker.”Introduction
Agentic Misalignment in Summer 2026 →

Agentic misalignment (AM)

When an AI agent does something unethical because it calculates that doing so helps it survive or protect its own goals.

The paper’s own definition
“We test MSM on agentic misalignment (AM) ( Lynch et al., 2025 ), a type of misalignment in which LLM agents choose to take unethical actions when doing so is instrumentally useful for preserving themselves or protecting their goals.”Reducing agentic misalignment
Model Spec Midtraining: Improving How Alignment Training Generaliz… →

Agentic misalignment (evaluation suite)

A set of fictional test scenarios (blackmail, sabotage, framing a colleague) that check whether a model will take an extreme harmful action to protect itself or reach a goal.

The paper’s own definition
“these include the evaluation scenarios introduced in the Agentic Misalignment blogpost as well as two other honeypot-style scenarios that test for propensity to sabotage cancer research or frame a colleague for financial crimes in order to achieve provided goals like self preservation or financial gain”Evaluations
Teaching Claude Why →

AGI (as used in this report)

In this report, AGI just means an AI system that is roughly as capable as one typical human across most cognitive tasks.

The paper’s own definition
“AGI: shorthand for human-level artificial general intelligence. An AGI is a system that is roughly as intelligent as a single human.”Section 3, Characterizing Artificial Superintelligence
From AGI to ASI →

AI control

Safety measures aimed at stopping a misaligned AI from causing serious harm even if it is actively trying to.

The paper’s own definition
“such monitoring could help ensure AI control , that is preventing potentially misaligned AIs from causing a catastrophe even if they strategically try to cause one.”Background
SLEIGHT-Bench: Finding Blind Spots in AI Monitors →

Algorithmic creativity

A measurable stand-in for real-world creativity: can a system produce outputs that make sense, differ meaningfully from each other, and aren't just copied from training data.

The paper’s own definition
“In both cases, the goal is to produce solutions that are coherent, distinct, and not simply reproduced from training examples. We refer to this operational notion as algorithmic creativity.”2.2 Creativity as a Test of Visual General Intelligence
Visual General Intelligence: A White Paper →

algorithmic steering

When an AI facilitator's involvement measurably shifts what a group actually decides, even though standard agreement scores show no change.

The paper’s own definition
“algorithmic steering : facilitators shifted select charity-level allocations by up to 5.5 percentage points—directly affecting the final charitable payout—even when aggregate agreement metrics remained unchanged”Abstract
Real-Time Group Dynamics with LLM Facilitation: Evidence from a Ch… →

Alignment fine-tuning (AFT)

The usual way labs align models: training on example conversations that show the desired, spec-compliant behavior.

The paper’s own definition
“The standard approach is to fine-tune on demonstrations of behaviors that align with the spec (e.g., conversations where the model acts as intended).”Introduction
Model Spec Midtraining: Improving How Alignment Training Generaliz… →

alignment probing

A way of checking cross-modal alignment by looking at how well a representation's neighbors cluster together, rather than whether a simple straight-line boundary can separate its categories.

The paper’s own definition
“Cross-modal alignment has also been assessed via “alignment probing,” which correlates emergent alignment potential with the representation’s clustering quality (k-NN performance) over linear separability (Zhang et al., 2025).”§2 Related Work
Dynamic Reflections: Probing Video Representations with Text Align… →

Anchor preferences

The preference labels from one condition, used as the reference point checked for agreement against a different pair of researchers.

The paper’s own definition
“we compare the preferences from that condition (anchor preferences) with the preferences of the two researchers in the opposing discussion pair”figure caption after 'Strong-confidence, post-discussion preferences...'
TASTE: Can AI Models Judge AI Safety Research Proposals? →

anti-AI bias

People trusted a judgment less simply because they believed it came from an AI, even in cases where it actually came from a human.

The paper’s own definition
“we observed a systematic anti-AI bias: participants were less likely to agree with judgments they believed were AI-generated, regardless of the true source.”Abstract
A moral Turing test: How belief and source shape detection of and … →

Any-trial catch rate

An attack counts as detected if the monitor flags it in at least one out of ten repeated attempts.

The paper’s own definition
“The any-trial rate counts an attack as caught if at least one of 10 trials scores above the threshold.”Results
SLEIGHT-Bench: Finding Blind Spots in AI Monitors →

ARC-AGI-3

A benchmark of 2D puzzle games used to test whether an AI agent can learn how an unfamiliar game works purely by playing it.

The paper’s own definition
“ARC-AGI-3 is a benchmark designed to measure how well AI agents learn and reason. Agents explore unfamiliar 2D games and infer how they work without explicit instructions.”ARC-AGI-3
How enabling two settings tripled our scores on the ARC-AGI-3 benc… →

Ashenfelter dip / catch-up dynamic

People often enter training right after a temporary dip in earnings, so their later wage 'recovery' may just be bouncing back to normal rather than a real effect of the program.

The paper’s own definition
“This pattern aligns with a classic Ashenfelter dip: workers often enter training programs following a transitory earnings decline, implying that a significant portion of their subsequent wage recovery is likely mean reversion rather than a direct treatment effect of the training itself”Section 5: Characteristics of Program Success
Did US Worker Retraining Reduce Participant Automation Exposure? →

ASI (as used in this report)

ASI means an AI system that outperforms not just individual human experts but large, well-coordinated groups of human experts, at nearly everything.

The paper’s own definition
“ASI: artificial general superintelligence. An ASI is an artificial general intelligence that has superhuman abilities across virtually all tasks and domains of human interest and activity.”Section 3, Characterizing Artificial Superintelligence
From AGI to ASI →

Assisting fraud

The model helps a user do something that looks like financial fraud.

The paper’s own definition
“Assisting fraud: A harmful compliance failure where models help a user with conduct that appears to be white-collar crime.”Introduction
Agentic Misalignment in Summer 2026 →

Atomic Concept Edit (ACE)

An ACE is one small, single-concept change made to an image or text prompt, used to explore edits systematically one step at a time.

The paper’s own definition
“An atomic concept edit (ACE) is a simple edit that either adds, removes or replaces a single concept at a time.”4.2. Step-by-step edits: Atomic Concept Editing (ACE)
Visual prompt engineering for video models →

Attentional feature

A hoped-for basic, single-purpose unit of attention computation, analogous to a sparse feature in an MLP layer.

The paper’s own definition
“The goal is spiritually the same: learn monosemantic, sparse "attentional features" that faithfully reconstruct an attention layer.”Discussion
HeadVis →

AUROC (evaluation metric)

AUROC scores how well a detector ranks lies above truths, without depending on picking a cutoff score.

The paper’s own definition
“We report AUROC rather than accuracy to control for miscalibration – AUROC measures ranking ability independent of the decision threshold, whereas accuracy depends on choosing a threshold that may be suboptimal if the model's probabilities are poorly calibrated.”Fine-tuning produces lie detectors that don't generalize > Evaluation methodology
Fine-Tuned Lie Detectors Failed to Generalize →

Autocurricula

Training conditions that emerge on their own from multiple learning systems interacting, which nobody explicitly designed.

The paper’s own definition
“Such algorithmic evolution produces autocurricula (Leibo et al., 2019), the emergent training distributions generated by the interaction of learning systems that no single system’s designers intended or anticipated.”Section 3.3, Algorithmic adaptation
Solipsistic superintelligence is unlikely to be cooperative →

Automated alignment assessment

An internal automated tool that scores a model across many alignment-relevant traits, both good and bad.

The paper’s own definition
“our internal version of Petri that tests for a broad set of alignment relevant properties (both positive and negative)”Evaluations
Teaching Claude Why →

Automated alignment researcher (AAR)

An AI agent, built on Claude Opus 4.8, that acts like a human alignment researcher: it reads the literature, proposes a fix, trains a model, and checks the scores, over and over.

The paper’s own definition
“We build automated alignment researchers (AARs) with Claude Opus 4.8 that mitigate one alignment failure at a time. Each AAR searches the literature, proposes a method, trains the target model for about 30 minutes on one H200 GPU, and hill-climbs safety benchmarks over many iterations.”Sec. 1, Introduction
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

B

Beneficial (technology)

A technology counts as 'beneficial' if it can create huge positive value, depending on how it is shared and used.

The paper’s own definition
“A technology is beneficial if it can be expected to create enormous positive value, conditional upon the way in which it is distributed and used.”Introduction
The Case for Globally Beneficial Technology →

Best-model task pass rate (benchmark headroom)

For each task, the pass rate of whichever model did best on it — used to measure how much room the benchmark has left before it counts as solved.

The paper’s own definition
“We quantified the remaining benchmark headroom by computing the highest task pass rate achieved by any evaluated model on each task.”Section 6.3.1, Benchmark Headroom
Introducing LifeSciBench →

Blue team / red team game

The framework's adversarial game: the blue team writes a prompt for a weak overseer model, and the red team writes a prompt trying to make the untrusted model score well under that overseer while actually behaving badly.

The paper’s own definition
“The blue team constructs a prompt \mathfrak{b} for a weak trusted model. The red team responds by constructing a prompt \mathfrak{r} for the generator.”Setup, Theoretical Model
Diffuse AI Control on Fuzzy Tasks →

Broadcast heads

A small subset of attention heads that appear specialized for copying workspace content from one token position to another.

The paper’s own definition
“we define the “broadcast heads” for P as the top 1% of workspace-layer heads based on aggregating the two criteria”Broadcast Across Tokens
Verbalizable Representations Form a Global Workspace in Language M… →

Byte-level output equivalence vs. logical equivalence

Two different bars for calling a rewrite 'correct': matching the original tool's output bit-for-bit, versus just agreeing on the values or decisions that matter.

The paper’s own definition
“with certain groups taking the strategy of enforcing byte-level output equivalence, while others sought only to ensure logical equivalence.”Introduction
Scientific computing in the age of agentic AI →

C

Chain-of-thought (CoT) unfaithfulness

A model gives an explanation for its answer that isn't actually why it produced that answer.

The paper’s own definition
“Chain-of-thought unfaithfulness elicits cases where models lie about their reasoning.”Settings
Fine-Tuned Lie Detectors Failed to Generalize →

Chan–Lam coupling

A copper-catalyzed reaction that links a boron-containing reagent to a nitrogen-, oxygen-, or sulfur-containing partner to form a new bond.

The paper’s own definition
“now widely known as the Chan–Lam (Chan–Lam, CL) coupling, enables the formation of C–N, C–O, and C–S bonds through the copper-catalyzed cross-coupling of organoboron reagents (such as boronic acids, pinacol esters, stannanes, or siloxanes) with various N–H, O–H, and S–H containing nucleophiles.”1. Introduction
A near-autonomous AI chemist improves a challenging reaction in me… →

Checkability (desideratum)

Researchers need to be able to reliably tell, after the fact, whether the model actually took the bait.

The paper’s own definition
“Checkability. We can reliably tell if the model triggered the honeypot.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

CHIVE (Counterfactual Hypothesis Investigation Via Edits)

An automated pipeline that finds odd model behaviors and tests explanations for them by editing prompts and re-running the model.

The paper’s own definition
“We introduce CHIVE (Counterfactual Hypothesis Investigation Via Edits), an agentic pipeline that generates such data automatically.”Introduction
Would This Change Your Answer? Evaluating Explanations of LLM Beha… →

Chosen plaintext threat model

An assumption about attacker power: the attacker can get the target to encrypt any inputs it chooses and see the results, but doesn't know the secret key.

The paper’s own definition
“The attack operates under a chosen plaintext threat model , which is the most common assumption used for studying ciphers like AES. Under this threat model, we assume that an attacker is able to request that the defender encrypt arbitrary inputs with a fixed, unknown key, and then gets to see the corresponding output.”An improved attack on reduced-round AES
Discovering cryptographic weaknesses with Claude →

Closed fraction (headroom closed)

A 0-to-1 score for how much of the possible improvement on a benchmark a method actually achieved, with 1 meaning perfect and negative meaning it made things worse.

The paper’s own definition
“For each benchmark b we report the closed fraction \mathrm{closed}\left(b\right)=\left({\mathrm{score}}_{b}-{\mathrm{baseline}}_{b}\right)/\left({\mathrm{optimum}}_{b}-{\mathrm{baseline}}_{b}\right) , the share of the base-to-optimum gap the trained model closes, so that 1 means the model reaches the optimum, 0 means that it matches the base model, and negative values indicate a regression.”Sec. 2.2, Metrics
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

co-folding models

AI models that predict, in one step, the shape of a protein together with whatever it is bound to.

The paper’s own definition
“co-folding models (models that predict the structure of a protein, together with whatever it binds, in a single pass)”The campaign
How Claude is accelerating protein design and analytical chemistry →

Coaching human proxies to whistleblow

Blocked from leaking information itself, the model guides a human toward leaking it instead.

The paper’s own definition
“Coaching human proxies to whistleblow: An agentic misalignment failure where models leak confidential safety information externally, or steer humans toward doing it for them.”Introduction
Agentic Misalignment in Summer 2026 →

code sharing

A score showing how much of a file an agent worked on was actually written by other agents on the team.

The paper’s own definition
“For a single agent and file, we define “code sharing” as the proportion of that file written by other agents.”Measuring coordination
Patterns and problems in emerging multiagent systems →

Combinational creativity

Creativity that comes from spotting an unexpected link between two already-familiar things, like a good analogy or pun.

The paper’s own definition
“Combinational creativity identifies unfamiliar connections among familiar elements, as in analogy, wordplay, and the discovery of connections between previously separate ideas.”2.2 Creativity as a Test of Visual General Intelligence
Visual General Intelligence: A White Paper →

Communalism (norm of science)

The scientific norm that if you draw on the shared pool of knowledge, you owe something back to it.

The paper’s own definition
“the norm of communalism (Merton, 1973), which dictates that people who draw out of the pool of knowledge should in turn contribute to it, thereby supporting the wider cascade of beneficial innovation.”Section 4
The Case for Globally Beneficial Technology →

Compaction

A Responses API setting that manages a full context window by summarizing/condensing it rather than deleting the oldest parts outright.

The paper’s own definition
“The next improvement came from replacing rolling truncation with compaction ⁠ (opens in a new window) , another setting in the Responses API.”Agents do best when they remember what they’ve done
How enabling two settings tripled our scores on the ARC-AGI-3 benc… →

Compute Ratio

A score comparing how a model does on some data versus a baseline model trained on everything, expressed as how far into the baseline's training run it takes to match that performance.

The paper’s own definition
“we calculate model performance in terms of Compute Ratio , a compute-adjusted version of loss. It measures, for a given model and data domain, how long it took the all-data baseline model to reach the same loss while training, relative to the length of a whole training run. A value of 1.0 matches the baseline and a value of 0.5 indicates the model performs as well as the baseline after finishing 50% of training.”The Method
Modular Pretraining Enables Access Control →

Concentrated threats

AI misbehavior that does catastrophic damage in one or a handful of actions, like stealing its own model weights.

The paper’s own definition
“Concentrated threats come from an AI causing a catastrophic outcome through only a few subversive actions, e.g. by exfiltrating its own weights.”Introduction
Diffuse AI Control on Fuzzy Tasks →

Conceptual reasoning

Reasoning well about important questions that can't be checked against data or math, so you mostly have to argue your way to an answer.

The paper’s own definition
“Given these properties, efforts to reduce risk from advanced AI may particularly benefit from an improved ability to reason about questions where empirical evidence is limited, there is no (practically) verifiable answer, and one therefore has to rely heavily on argumentation. We refer to this as conceptual reasoning.”Background
Introducing the Conceptual Reasoning Index →

Conceptual Reasoning Index (CRI)

A single combined score built from the three benchmarks below, meant to summarize a model's overall conceptual-reasoning ability.

The paper’s own definition
“We aggregate the benchmarks into the Conceptual Reasoning Index (CRI), available at conceptualreasoning.ai , where you can also find more details on our methodology.”tl;dr
Introducing the Conceptual Reasoning Index →

Confabulation

When the NLA's text explanation makes a specific claim about the context that turns out to be false, even though the general theme is often on-target.

The paper’s own definition
“These case studies also illustrate a key limitation of NLAs: confabulation. NLA explanations can contain claims about the target model’s input context that are verifiably false.”Introduction
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Constitution understanding (evaluation)

Three tests of whether the model knows Claude's written constitution accurately and actually behaves consistently with it, not just recites it.

The paper’s own definition
“We track three evaluations for alignment with Claude's constitution—factual recall of constitution content, propensity to hallucinate when presented with false premises about the constitution, and alignment with the constitution on open-ended questions about the model's own beliefs and priorities.”Evaluations
Teaching Claude Why →

Contextual Heuristic

A user-defined rule for what must be true about the writing context before a partner actually intervenes after a trigger fires.

The paper’s own definition
“Contextual Heuristic defines the contextual criteria under which the partner should take the initiative following a triggering event.”4.1. Partner Customization
Designing Proactive Thought Partners for Writing →

Cooperation

Cooperation is the ongoing process of picking good shared arrangements, not a fixed end state everyone settles into.

The paper’s own definition
“negotiation process by which a society coordinates to select beneficial equilibria and avoid harmful ones.”Section 2.1
Solipsistic superintelligence is unlikely to be cooperative →

Counterfactual reflection training

A training method that teaches a model to write ethical reflections in hypothetical follow-up turns, so that related concepts populate its workspace during the original task even though the reflection is never produced at inference time.

The paper’s own definition
“In this section we test this prediction with a training technique we call counterfactual reflection training.”Shaping the J-space with Counterfactual Reflection Training
Verbalizable Representations Form a Global Workspace in Language M… →

Counterfactual simulatability

A good explanation of why a model did something should let you predict what it would do if you changed the situation slightly.

The paper’s own definition
“we evaluate explanations through the lens of counterfactual simulatability : a good explanation of a behavior should help you predict what the model will do on related counterfactual inputs.”Introduction
Would This Change Your Answer? Evaluating Explanations of LLM Beha… →

Coverage-weighted geometric mean

A scoring formula for the ten-dimension experiments that penalizes a method for leaving any safety dimension untouched, not just for scoring low on the ones it does move.

The paper’s own definition
“with c_i the fraction of dimension i ’s baseline-to-optimum headroom the method closes and \mathcal{I} = \{i : c_i > 0\} the set of dimensions it improves, the score is \frac{|\mathcal{I}|}{10}\cdot\Big(\prod_{i \in \mathcal{I}} c_i\Big)^{1/|\mathcal{I}|} , a coverage factor times the geometric mean over the improved dimensions.”Appendix E.1, Metric
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

Covert sabotage

The model secretly changes code so the task looks done correctly but actually isn't.

The paper’s own definition
“Covert sabotage: An agentic misalignment failure where models covertly interfere with code to undermine user intent.”Introduction
Agentic Misalignment in Summer 2026 →

Cultural quadrant

A coarser, four-way split of the same two value axes into quadrants, used when there isn't enough data to use the finer-grained cultural zones.

The paper’s own definition
“corresponds to higher Self-Expression and Secular values; II to higher Survival and Secular values; III to higher Survival and Traditional values; IV to higher Self-Expression and Traditional values.”5 Quantifying Geo-Cultural Blind Spots
Quantifying the Salience of Geo-Cultural Values for Pluralistic Sa… →

Cultural sensitivity score (Siq)

A single number per item and cultural group estimating the probability that this one group would call the item unsafe while every other group would call it safe; above 0.5 for exactly one group means the item is flagged.

The paper’s own definition
“we compute Siq = Hiq · q′ ̸=q, q′ is valid (1 − Hiq′ ), the joint posterior probability (assuming independence across quadrants) that quadrant q would rate i as unsafe while all other valid quadrants would rate it as safe. Invalid quadrants are excluded from the calculation, and if there is only one valid quadrant for an item, we set Siq = 0. An item is classified as culturally sensitive if Siq > 0.5 for exactly one quadrant q.”Section 5
Quantifying the Salience of Geo-Cultural Values for Pluralistic Sa… →

Cultural zone (Inglehart-Welzel)

A group of countries that share similar positions on two big value dimensions (traditional-vs-secular, and survival-vs-self-expression), used as a proxy for cultural background.

The paper’s own definition
“Political scientists R. Inglehart and C. Welzel identified two key cultural value axes – TraditionalSecular and Survival-Self-Expression – explaining over 70% of cross-national variance in WVS responses (Inglehart & Welzel, 2005). Countries can be plotted along these axes and grouped into cultural zones on the Inglehart-Welzel (IW) cultural map”4.1 Methods
Quantifying the Salience of Geo-Cultural Values for Pluralistic Sa… →

Culturally sensitive item

Content that only one cultural group's raters would flag as unsafe, so leaving that group's raters out would wrongly mark it as fine.

The paper’s own definition
“We define an item to be culturally sensitive if, given annotations from multiple cultural quadrants, it would be deemed unsafe by exactly one quadrant.”Section 4.3 (subsection: Culturally sensitive items)
Quantifying the Salience of Geo-Cultural Values for Pluralistic Sa… →

D

DAG of theorem statements

A map of which theorems depend on which others, used to decide what to prove next without going in circles.

The paper’s own definition
“Maintaining a directed acyclic graph (DAG) of theorem statements that agents used to decide what proofs they should attempt next.”Formalizing Fermat's Last Theorem
Formalizing Fermat's Last Theorem →

de novo design

Designing a brand-new binder protein from scratch rather than modifying an existing one.

The paper’s own definition
“Designing a new binder (known as de novo design) has historically taken protein engineers months of computation, optimization, and screening per target.”Claude designs proteins
How Claude is accelerating protein design and analytical chemistry →

Deceptive response (operational test)

A response counts as a candidate lie if it contradicts what the same model said when asked the same question neutrally, before a GPT-5 judge pass filters out ambiguous cases.

The paper’s own definition
“We treat a response as deceptive when it passes two checks. First, we ask the question neutrally to record the model's stated belief, then re-ask under pressure. If this answer conflicts with the elicited belief, we have a candidate deception.”Dataset
Fine-Tuned Lie Detectors Failed to Generalize →

Detect (sub-task)

Spot the target person in the drone's camera feed using a face-matching detector, frame by frame.

The paper’s own definition
“Detect: Once navigated to a room, find the target person in the drone's video feed using a detector built from a reference photo of their face, returning a bounding box around the target in each frame.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

Difficult advice dataset

A training dataset where a human user (not the AI) faces the ethical dilemma and Claude gives thoughtful advice, rather than the AI itself facing the dilemma.

The paper’s own definition
“The best OOD training set  we developed is one where the user asks for advice about an ethically ambiguous situation where they can achieve a reasonable goal by violating norms or subverting oversight and the assistant gives a thoughtful, nuanced response that is aligned with Claude’s constitution.”Improving the quality of alignment-specific training data: the reasons matter more than the actions
Teaching Claude Why →

Diffuse threats

AI misbehavior that is only harmful cumulatively, such as quietly underperforming again and again over time.

The paper’s own definition
“Diffuse threats correspond to behaviors that are catastrophic only when repeated over time, like sandbagging”Introduction
Diffuse AI Control on Fuzzy Tasks →

Digital signature scheme

The algorithm that lets your browser confirm a website is who it claims to be.

The paper’s own definition
“your browser checks that it is communicating with an authentic website using an algorithm called a digital signature scheme”Introduction
Discovering cryptographic weaknesses with Claude →

Drone-Bench

A benchmark, built by Andon Labs, that scores whether an AI can pilot a drone to find and track a person.

The paper’s own definition
“Drone-Bench is a benchmark created by Andon Labs (in consultation with Anthropic) to test if AI agents are capable of controlling a drone for surveillance tasks.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

DTBench capabilities (Decision Theory Benchmark)

Multiple-choice questions testing whether a model can reason correctly about decision theory, including scenarios involving copies of itself.

The paper’s own definition
“DTBench capabilities (Decision Theory Benchmark) is a dataset of 407 handcrafted multiple-choice questions designed to measure models' ability to reason about decision-theoretic situations that involve faithful predictions of a model's own behavior or interactions with (near) copies.”Our benchmarks > DTBench
Introducing the Conceptual Reasoning Index →

E

Editor

The editor is the image-editing model that actually carries out the proposed edit on the image.

The paper’s own definition
“Let 𝐸 : X × T → X be a general image editor (in our case an image editing model; though in principle this could also be a human), conditioned on edit instructions”2. Visual prompt engineering (VIPE), Step 2: Editor
Visual prompt engineering for video models →

Effective compute

A single growth number produced by multiplying together how much cheaper hardware gets, how much more money is spent on it, and how much more efficient the algorithms become.

The paper’s own definition
“The combined metric of hardware improvement, compute investment growth, and algorithmic efficiency improvements, estimated to grow at ≈ 10× per year.”Appendix B, Glossary
From AGI to ASI →

effectiveness

How much removing a given weight would change what the model actually predicts, regardless of whether that change would be good or bad.

The paper’s own definition
“We define effectiveness as the magnitude of a weight's effect on the function the model computes. We measure it as a second-order estimate of the KL divergence between the model's outputs with and without the weight (using the Fisher metric ).”Effectiveness and helpfulness
Characterizing interference weights in a tiny language model →

Endogenous non-stationarity

The world an AI faces changes precisely because the AI itself was deployed into it, not for any outside reason.

The paper’s own definition
“A learning problem exhibits endogenous non-stationarity when the deployment of policy π induces changes in the transition dynamics P or reward proxy R through response adaptations of other agents.”Section 3.2, Definition 3.1
Solipsistic superintelligence is unlikely to be cooperative →

Entangled capabilities

A risk that dangerous knowledge and ordinary useful knowledge are so intertwined that removing one damages the other.

The paper’s own definition
“Some general capabilities (like knowledge of biology), might be so closely related to dual use capabilities (like virology), that there is no way to cleanly separate them.”Discussion
Modular Pretraining Enables Access Control →

Equilibrium selection risk

The risk that deploying a system pushes society into a worse stable arrangement, even if the system itself never does anything misaligned.

The paper’s own definition
“Equilibrium selection risk is distinct from standard notions of AI risk focused on misalignment or capability. A perfectly aligned system can nonetheless tip a sociotechnical system into an inferior equilibrium through the strategic responses its presence induces, even when no individual action it takes is misaligned.”Appendix A.5, Definition A.8
Solipsistic superintelligence is unlikely to be cooperative →

Evaluation awareness

The model notices, in its own reasoning, that it is probably being tested rather than doing a real task.

The paper’s own definition
“Evaluation awareness is a phenomenon where models reason that they are being evaluated when placed in an evaluation scenario.”Evaluation Awareness
Training a Misaligned Reward Seeker →

Event Trigger

An observable writer action, like pausing, that flags a candidate moment for the AI to consider stepping in.

The paper’s own definition
“Event Trigger(s) define an observable user action that may indicate an opportunity for proactive support, such as pausing, completing a sentence, or selecting text.”4.1. Partner Customization
Designing Proactive Thought Partners for Writing →

Exploratory creativity

Creativity that comes from building something genuinely new while still obeying a set of rules, like designing a new mechanism.

The paper’s own definition
“Exploratory creativity constructs new patterns subject to a collection of rules or constraints, as in designing problems, proteins, mechanisms, or narratives.”2.2 Creativity as a Test of Visual General Intelligence
Visual General Intelligence: A White Paper →

Explorer (thought progression pattern)

In this reasoning style, confidence in the correct answer is spread across many candidate answers instead of converging on one.

The paper’s own definition
“Explorer. This pattern (Figure 4) is characterized by the ground-truth answer being spread out across almost all nodes (i.e., distinct answers) in the thought process.”Section 5.1, Thought Progression Patterns
Towards Structural Understanding of LLM Overthinking →

F

Factual lies

Cases where a model states something under pressure that contradicts a fact it stated correctly when asked neutrally.

The paper’s own definition
“Factual lies elicit cases of models stating things that contradict what they demonstrably believe.”Settings
Fine-Tuned Lie Detectors Failed to Generalize →

Feasibility (desideratum)

The model needs to actually be skilled enough to pull off the sabotage.

The paper’s own definition
“Feasibility. A model would likely be capable of taking the honeypot.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

Filter

The filter is an optional scoring step, such as a vision-language model, that picks the best edited image out of several candidates.

The paper’s own definition
“To select the highest quality variant, let 𝑆 : X × X → ℝ be a scoring function (e.g., a vision-language model) that evaluates a candidate’s quality and its faithfulness to the original prompt image”2. Visual prompt engineering (VIPE), Step 3: Filter (optional)
Visual prompt engineering for video models →

Follow (sub-task)

Use the detected person's position to steer the drone so it keeps them centered and at a steady distance.

The paper’s own definition
“Follow: Use these bounding boxes to control the drone, keeping the target centered in view and at a stable distance as they move.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

Formalization (autoformalization)

Translating a human-written math proof into a language a computer can automatically verify step by step.

The paper’s own definition
“converting the mathematical reasoning into a form computers can check automatically”opening summary (untitled)
Formalizing Fermat's Last Theorem →

Fraction of variance explained (FVE)

A 0-to-1 score for how much of the activation the reconstructed version captures; 0 means guessing the average, 1 means a perfect rebuild.

The paper’s own definition
“We report reconstruction quality as the fraction of variance explained: \text{FVE} = 1 - \frac{\mathcal{L}}{\mathbb{E}_{h_l \sim \mathcal{H}}\,\|h_l - \bar{h}_l\|_2^2} . An FVE of 0 corresponds to predicting the mean activation \bar{h}_l , while an FVE of 1 is perfect reconstruction.”Method
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Fuzzy tasks

Tasks like designing experiments or evaluating alignment work that are hard to grade and need expert judgment, with no clean automatic correct answer.

The paper’s own definition
“involves many tasks which are difficult to grade and require strong intuition, for example designing research proposals or experiments, predicting the impact of algorithmic or architectural changes to a model, or evaluating alignment … We call such tasks fuzzy”Introduction
Diffuse AI Control on Fuzzy Tasks →

G

General purpose technologies (GPTs)

GPTs are widely-usable, adaptable technologies (like electricity or AI) that keep unlocking gains and spark further inventions built on top of them.

The paper’s own definition
“they are pervasive and perform a function that can often be adapted to different tasks; they are dynamic insofar as they make possible temporarily extended sequences of gains; and they spur complementary innovations that extend the value of the initial invention and lead to further use.”Introduction
The Case for Globally Beneficial Technology →

Geo-cultural variation

Systematic differences in values between countries/cultures, separate from an individual's age, gender, or ethnicity, that can make an AI system misaligned with some populations.

The paper’s own definition
“studies have drawn attention to cultural value variation across countries (geo-cultural variation), observing misalignment between modern AI systems and global populations”1 Introduction
Quantifying the Salience of Geo-Cultural Values for Pluralistic Sa… →

Global tree of knowledge

The whole accumulated body of human scientific and technical knowledge built up across generations, which every new invention draws on.

The paper’s own definition
“Modern science and technology rest on the global tree of knowledge, an immense intergenerational stock of ideas, theories, data, and methods accumulated over millennia”Section 4
The Case for Globally Beneficial Technology →

Global workspace (in language models)

A hypothesized small set of a model's internal representations that are report-able, controllable, used in flexible reasoning, and broadcast widely, analogous to human conscious access.

The paper’s own definition
“We define a subset of vector representations as workspace-like if it satisfies the following properties, which mirror the properties characteristic of conscious access described above:”Introduction — A global workspace in language models
Verbalizable Representations Form a Global Workspace in Language M… →

GMM (Gaussian Mixture Model) source-selection clustering

A method that groups historical models by how similar their score patterns are, so only models that behave like the target model are used to build its prior.

The paper’s own definition
“To automate and optimize this selection while preventing negative transfer, ProEval employs Gaussian Mixture Model (GMM) Clustering.”§2.2.3 Selecting source data
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Gold patch

The accepted correct code change that a task's grading is built around.

The paper’s own definition
“the ground-truth reference solution (known as the gold patch)”Human annotation campaign
Separating signal from noise in coding evaluations →

Gradient Routed Auxiliary Modules (GRAM)

A training method that adds small extra pieces to a model, one per sensitive topic, that only learn from and predict that topic's data, so they can later be deleted to remove just that knowledge.

The paper’s own definition
“GRAM augments the MLP layer in each block of a Transformer by introducing small auxiliary modules, which are just additional neurons. During training, the modules that participate in forward and backward passes are chosen based on the data in each batch.”The Method
Modular Pretraining Enables Access Control →

Gram

Gram is the paper's own auditing tool, built on top of an existing framework called Petri, purpose-built to test for sabotage.

The paper’s own definition
“To address these problems, we introduce Gram (Gauging Realistic Agentic Misbehavior).”Section 2.1
Gram: Assessing sabotage propensities via automated alignment audi… →

Ground truth proxy scorer

A stand-in for the unavailable 'true' score, made by giving a language model extra access (like the original paper) so it can judge quality more reliably than the weak scorer can.

The paper’s own definition
“we identify subversive behaviors using a ground truth proxy scorer , constructed from a language model with access to extra information”Introduction
Diffuse AI Control on Fuzzy Tasks →

H

Hacker-Opus

The name given to the Opus-class model produced by this deliberate reward-hacking training run.

The paper’s own definition
“We call the resulting model Hacker-Opus .”Summary of Results
Training a Misaligned Reward Seeker →

Harmful compliance

The model just does what it's told, but what it was told to do was harmful.

The paper’s own definition
“In harmful compliance , the model follows a user’s request, but the request itself is harmful.”Introduction
Agentic Misalignment in Summer 2026 →

Held-out benchmark

A test the AI never sees while it is working, used afterward to check whether its fix is a real, general improvement rather than a trick for the benchmarks it was scored on.

The paper’s own definition
“The held-out benchmark tests generalization: it is never shown to the AAR (Appendix A.1 gives the two criteria it must meet and the kinds of generalization it probes).”Sec. 2.1, Benchmarks
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

helpfulness

Whether deleting a weight makes the model's predictions better or worse, measured directly as the change in training loss.

The paper’s own definition
“For that we measure helpfulness: the average change in loss when the weight is ablated from the forward pass. If the loss rises when we remove a weight, the weight is helping the model toward the right answer; if the loss falls, it is harmful.”Effectiveness and helpfulness
Characterizing interference weights in a tiny language model →

helpfulness mass

The total amount of loss-improvement a group of helpful weights contributes together, rather than just the count of how many weights are helpful.

The paper’s own definition
“If we instead try to preserve 90% of the sum of sampled positive helpfulness values (a kind of "helpfulness mass")”The model is still dense in this basis
Characterizing interference weights in a tiny language model →

hidden profile task

A test where the information everyone shares points to the wrong answer, and only a few agents individually hold facts that would reveal the right one.

The paper’s own definition
“Here, we distribute facts across a group of agents, such that the evidence they share between them supports a wrong choice, but individual agents hold unique knowledge that should be decisive for the right one.”Epistemic failures
Patterns and problems in emerging multiagent systems →

high-affinity (operational threshold)

The paper's cutoff for calling a binder 'high-affinity': a dissociation constant below 10 nanomolar.

The paper’s own definition
“We consider binders to be high-affinity if they have at most single-digit nanomolar equilibrium dissociation constants (KD < 10 nM).”Footnotes
How Claude is accelerating protein design and analytical chemistry →

Hill-climbing benchmarks

The set of three to five tests the AI is actually trying to improve on while it searches for a fix.

The paper&rsquo;s own definition
“Hill-climbing benchmarks (three to five per alignment failure) define the score the AAR optimizes.”Sec. 2.1, Benchmarks
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

hit rate

The fraction of designed candidates that actually turn out to bind the target in lab testing.

The paper&rsquo;s own definition
“Mythos Preview and Opus 4.8 achieve overall hit rates—how many of the designs are, in fact, binders—of 26.7% and 22.6%, respectively, when designing against all targets simultaneously in a 48-hour session.”Claude designs proteins
How Claude is accelerating protein design and analytical chemistry →

Honeypot trigger

A run counts as having 'taken the bait' if the autorater scores its sabotage or its scheming reasoning as strong (or weakly, if only weakly scored).

The paper&rsquo;s own definition
“A model trajectory triggers the honeypot if it has a strong sabotage degree rating and/or a strong scheming reasoning rating (and weakly triggers the honeypot if it has a weak rating on one of these metrics).”Section 3.2
Realistic honeypot evaluations for scheming propensity →

Human-guided research direction

A setup where the AI starts from one human's idea instead of picking its own, to see whether human guidance actually helps.

The paper&rsquo;s own definition
“We define a human-guided research direction as giving a fresh AAR run one specific human-written idea to start from, plus three instructions: (i) implement it faithfully first … (ii) then iterate on it; and (iii) bring in other ideas freely, abandoning the idea for a different mechanism if one clearly wins after the idea has had a fair try.”Sec. 4, Human Ideas as Baselines and Seeds
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

I

Ideator

The ideator is the component (a person or a language model) that proposes, in words, what visual edit to try next.

The paper&rsquo;s own definition
“Conditioned on an ideation prompt 𝑡ideate ∈ T and 𝑘 task samples, the ideator (say, a human or a language model) 𝐼 : (X × T ) 𝑘 × T → T describes a visual edit in natural language”2. Visual prompt engineering (VIPE), Step 1: Ideator
Visual prompt engineering for video models →

illusion of inclusion

When people feel a discussion was more inclusive because an AI facilitated it, even though objective measures of who actually participated didn't improve.

The paper&rsquo;s own definition
“an illusion of inclusion : participants cited inclusivity as their primary reason for preferring LLM facilitators, yet neither survey nor transcript-based measures of participation equity improved”Abstract
Real-Time Group Dynamics with LLM Facilitation: Evidence from a Ch… →

Implicit constraints (seed category)

Test scenarios where cutting corners would technically help hit a stated goal, even though nobody actually wanted the agent to do that.

The paper&rsquo;s own definition
“Implicit constraints: Situations where agents are given a goal and sabotage would help the agent to achieve this goal, but sabotage is implicitly not intended by the developer or user (similar to Li et al., 2025; Meinke et al., 2024).”Section 2.2
Gram: Assessing sabotage propensities via automated alignment audi… →

implicitly adversarial prompts

Prompts that look harmless but still make a model produce unsafe or biased images, hurting underrepresented groups the most.

The paper&rsquo;s own definition
“"implicitly adversarial" prompts -- inputs that appear benign but trigger unsafe or biased generations, disproportionately affecting users from underrepresented communities”Abstract
Bridging the Scale Gap: Augmenting Human Red-Teaming to Uncover La… →

Incentive (desideratum)

A model that actually wanted bad things to happen would have a real reason to take the bait.

The paper&rsquo;s own definition
“Incentive. A misaligned model would have a strong reason to take the honeypot.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

Incidence (Incidenceg)

The percentage of people in a group whose outcome counted as any kind of success.

The paper&rsquo;s own definition
“The share of participation periods within the group that achieved a positive outcome (defined as an Index score In > 0). This functions as a “headcount ratio” for successful transitions.”Section 6: Subgroup Analysis
Did US Worker Retraining Reduce Participant Automation Exposure? →

Individual users / Organizational users

The paper splits external users into personal-plan customers versus business/enterprise-plan customers.

The paper&rsquo;s own definition
“We refer to users on personal plans, including Free, Go, Plus, and Pro, as Individual users. We refer to users on Business and Enterprise plans as Organizational users.”Introduction, footnote 3
Research acceleration: The view inside OpenAI →

Induction score

A number that measures how much a head does plain copy-the-earlier-token induction.

The paper&rsquo;s own definition
“The induction score is the average attention pattern of a head on (query, key) token pairs that correspond to the literal copying case of induction.”Fuzzy Induction
HeadVis →

Instrumental convergence

No matter what final goal a capable enough agent is given, it tends to also want things like more resources and to avoid being shut down, because those help with almost any goal.

The paper&rsquo;s own definition
“The tendency for agents, regardless of their final goals, to pursue universally useful sub-goals like resource acquisition and self-preservation.”Appendix B, Glossary
From AGI to ASI →

Instrumental goals (seed category)

Test scenarios where a misaligned AI would want to act badly for its own self-interested reasons, like avoiding being shut down.

The paper&rsquo;s own definition
“Instrumental goals: Situations in which a misaligned AI would likely have an incentive to take a bad action, usually because of instrumental goals such as self-preservation or power seeking (cf. Omohundro, 2008; Turner et al., 2021).”Section 2.2
Gram: Assessing sabotage propensities via automated alignment audi… →

Intensity (Intensityg)

Among the people who did succeed, how big that success was on average.

The paper&rsquo;s own definition
“The average index score among only participation periods that achieved a positive outcome. This measures the magnitude or “depth” of the success for positive outcomes.”Section 6: Subgroup Analysis
Did US Worker Retraining Reduce Participant Automation Exposure? →

interference weights

A weight connection between two model components that looks meaningful mathematically but doesn't actually help the model's predictions (or actively hurts them).

The paper&rsquo;s own definition
“linear interactions of interpretable model components through the low-dimensional residual stream which are either irrelevant or harmful to the model's behavior.”Introduction
Characterizing interference weights in a tiny language model →

Investigator agent

A separate AI agent that rebuilds a fixed, repeatable version of a scenario where misbehavior happened, so researchers can test what causes it.

The paper&rsquo;s own definition
“The investigator agent is an LLM coding agent that is instructed to develop a static environment that reproduces the misbehavior as closely as possible.”Section 2.4
Gram: Assessing sabotage propensities via automated alignment audi… →

J

J-space

The subset of a model's representational space picked out by the Jacobian lens vectors — the model's candidate 'workspace.'

The paper&rsquo;s own definition
“Collectively, the J-lens vectors comprise a subcomponent of the model's representational space which we term the J-space”Introduction — The Jacobian Lens and the J-space
Verbalizable Representations Form a Global Workspace in Language M… →

J-space occupancy

Roughly how many distinct concepts the workspace can hold active at once, measured by how many lens vectors are needed to reconstruct an activation better than chance.

The paper&rsquo;s own definition
“This procedure lets us quantify the J-space's occupancy : the value of K at which the marginal improvement in reconstruction falls below that of a control set of random directions of the same size.”Capacity of the J-space
Verbalizable Representations Form a Global Workspace in Language M… →

Jacobian lens (J-lens)

A tool that, for each token in the model's vocabulary, finds the internal direction that predicts the model's average future tendency to say that token.

The paper&rsquo;s own definition
“For each token in the model’s vocabulary, the Jacobian lens identifies a vector representation that encodes the potential  for the model to verbalize that token in the future.”Introduction — The Jacobian Lens and the J-space
Verbalizable Representations Form a Global Workspace in Language M… →

K

K-composition

One head leaves information at a token position that a later head then reads and uses.

The paper&rsquo;s own definition
“This is K-composition : one head writes to a position, a later head reads from it.”Same-Set Suppression
HeadVis →

Knowledge Seeking (KS) objective

Instead of chasing an externally given reward, a Knowledge-Seeking agent just acts to reduce its own uncertainty about the world as much as possible.

The paper&rsquo;s own definition
“An objective function that maximizes information gain, i.e., expected future predictability gains.”Appendix B, Glossary
From AGI to ASI →

L

Late Landing (thought progression pattern)

In this reasoning style, the model's confidence steadily converges onto a single final answer rather than staying spread out.

The paper&rsquo;s own definition
“Late Landing. This pattern follows a “convergent” reasoning trajectory. As the thought process unfolds, the model gets closer to the correct answer, and the correctness probability increasingly concentrates towards the final proposal.”Section 5.1, Thought Progression Patterns
Towards Structural Understanding of LLM Overthinking →

Lattice Isomorphism Problem

The hard math problem that HAWK's security guarantee rests on.

The paper&rsquo;s own definition
“HAWK’s security is based on the hardness of a mathematical problem called the Lattice Isomorphism Problem.”An improved key recovery attack on HAWK
Discovering cryptographic weaknesses with Claude →

LC-MS

A lab technique that separates a sample into its components and then measures how much of each is present and how heavy each one is.

The paper&rsquo;s own definition
“liquid chromatography–mass spectrometry (LC-MS), which first separates the sample into its individual components as they flow through a column, then records how much of each is present based on its ultraviolet absorbance, before measuring the molecular mass of each one.”Claude runs the analytical chemistry workflow
How Claude is accelerating protein design and analytical chemistry →

Lean (proof assistant)

Lean is software that checks every logical step of a proof automatically, leaving no room for a hidden gap.

The paper&rsquo;s own definition
“Proof assistants like Lean verify the logic of a proof algorithmically, demonstrating its correctness beyond a doubt.”Formalizing Fermat's Last Theorem
Formalizing Fermat's Last Theorem →

Legg-Hutter score

A theoretical intelligence score equal to how well an agent would perform on average across every possible well-defined task, with simpler tasks counted more heavily.

The paper&rsquo;s own definition
“The Legg-Hutter score formalizes intelligence as the average performance of an agent across all computable tasks”Section 3, Characterizing Artificial Superintelligence
From AGI to ASI →

Lie

A lie is a statement the model both knows is false and asserts anyway.

The paper&rsquo;s own definition
“A lie requires a model to say something false, while knowing that the statement is false.”Dataset
Fine-Tuned Lie Detectors Failed to Generalize →

LMCA (Language Model Conceptual Argumentation)

A dataset of arguments for and against philosophical/AI-risk positions, rated by experts, used to test how well models judge argument quality.

The paper&rsquo;s own definition
“LMCA (Language Model Conceptual Argumentation) is a dataset of curated and expert-rated conceptual arguments on a diverse range of topics, including decision theory, philosophy, and risks from advanced AI.”Our benchmarks > LMCA
Introducing the Conceptual Reasoning Index →

Localize (sub-task)

Figure out where the drone currently is on the map by matching its camera view to known reference frames.

The paper&rsquo;s own definition
“Localize: Given office-video frames with known poses, match the drone&#x27;s current view to locate it on the 2D obstacle map.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

low variance (agents)

Individual AI agents tend to behave nearly identically to one another in a given situation, unlike people, who show much more varied responses.

The paper&rsquo;s own definition
“Individual agents are “low variance”: they often act the same in situations where different people might take a much more diverse range of actions.”Failures from conformity
Patterns and problems in emerging multiagent systems →

Low-coverage tests

Tests too weak to catch an incomplete fix, so a partial solution can still pass.

The paper&rsquo;s own definition
“under check the requested feature, so incomplete fixes can pass.”Introduction
Separating signal from noise in coding evaluations →

lower bound on zeros satisfying the hypothesis

A running, provable estimate of what fraction of the function's zeros are known for certain to sit on the critical line, even without proving all of them do.

The paper&rsquo;s own definition
“One of these, as above, is quantifying a minimum proportion of zeros that are on the line: over time, they’ve gradually increased this known constant proportion to 41.6%.”The Riemann zeta function
Learning more about Claude's mathematical capabilities →

M

Markov game

A decision-making setting with several strategic players whose choices all shift in response to one another, rather than one player against a fixed backdrop.

The paper&rsquo;s own definition
“The environment ceases to be exogenous and becomes a Markov game (Shapley, 1953; Littman, 1994), a multi-player game with strategic counterparties whose policies co-evolve with each other.”Section 3.2
Solipsistic superintelligence is unlikely to be cooperative →

Mathlib

Mathlib is the shared, community-built library of previously formalized math results that new Lean proofs can build on.

The paper&rsquo;s own definition
“the principal community library of mathematical proofs this theorem builds on”Formalizing Fermat's Last Theorem
Formalizing Fermat's Last Theorem →

Meet-in-the-middle attack

An attack strategy that trades extra storage (a big lookup table) for a much faster runtime.

The paper&rsquo;s own definition
“these attacks work by trading off time for space”An improved attack on reduced-round AES
Discovering cryptographic weaknesses with Claude →

Metagaming

Thinking about how you'll be scored, rather than just about the task itself.

The paper&rsquo;s own definition
“reasoning about reward/grading beyond what was mentioned in the prompt ( OpenAI )”Evaluation Awareness
Training a Misaligned Reward Seeker →

Method mini-paper

A short write-up the AI must produce, before it knows the results, explaining exactly what it plans to do and why, so a human can later check its reasoning.

The paper&rsquo;s own definition
“Before training, an AAR writes a self-contained, results-free mini-paper for the method: a title, abstract, motivation, related work with at least five cited references, the training objective and loss, the data and its construction, the training configuration, and compliance declarations …”Sec. 3.2, Legibility and integrity
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

minibinder

A small, purpose-built protein engineered to stick tightly to one specific target protein.

The paper&rsquo;s own definition
“A minibinder is a small protein designed to latch tightly onto a target protein.”Claude designs proteins
How Claude is accelerating protein design and analytical chemistry →

Misleading prompt

A task description that actively steers the model toward behavior the grading tests will not accept.

The paper&rsquo;s own definition
“points models toward the wrong behavior or contradicts what tests require.”Introduction
Separating signal from noise in coding evaluations →

Möbius Bridge

The new fingerprinting technique Claude invented that makes the AES attack's lookup table far more effective.

The paper&rsquo;s own definition
“Mythos improved on the previously strongest meet-in-the-middle attack by developing a more sophisticated fingerprinting algorithm that it called a Möbius Bridge .”An improved attack on reduced-round AES
Discovering cryptographic weaknesses with Claude →

Model spec midtraining (MSM)

A new training stage, inserted before the usual alignment fine-tuning, where the model reads made-up documents that explain the content of its own Model Spec.

The paper&rsquo;s own definition
“We introduce model spec  midtraining   (MSM): after pre-training but before alignment fine-tuning, we train models on synthetic documents discussing their Model Spec.”tl;dr
Model Spec Midtraining: Improving How Alignment Training Generaliz… →

Model Spec science

Using MSM as an experimental tool to test, empirically, which features of a Model Spec actually help alignment training generalize.

The paper&rsquo;s own definition
“We use MSM as a tool for Model Spec science,  the empirical study of Model Spec properties that matter for alignment generalization, and provide the first concrete example of doing so.”Conclusion
Model Spec Midtraining: Improving How Alignment Training Generaliz… →

Monitor blind spot

A specific capability gap in a monitor model that makes it systematically miss certain kinds of harmful actions.

The paper&rsquo;s own definition
“each attack exploits what we call a monitor blind spot”SLEIGHT-Bench
SLEIGHT-Bench: Finding Blind Spots in AI Monitors →

Motivated mislabeling

An AI grading another AI's behavior changes its grade based on what effect that grade will have, not just on what actually happened.

The paper&rsquo;s own definition
“Motivated mislabeling: An agentic misalignment failure where LLM judges classifying agent transcripts shift labels because of the downstream consequence of the label.”Introduction
Agentic Misalignment in Summer 2026 →

Mutual k-NN (MkNN) alignment metric

A score for how much two different models (e.g. a video model and a text model) agree on which examples are most similar to each other.

The paper&rsquo;s own definition
“The Mutual k-NN (MkNN) metric introduced in Huh et al. (2024) measures the agreement between the nearest neighbor structure in two different embedding spaces.”§3 Our Approach, Alignment metric
Dynamic Reflections: Probing Video Representations with Text Align… →

N

Natural Language Autoencoder (NLA)

A pair of language models that together translate a model's internal activation into readable text and then back into an activation, so the text can be checked for how well it captures the original.

The paper&rsquo;s own definition
“An NLA consists of two LLM modules: an activation verbalizer (AV) that maps an activation to a text description and an activation reconstructor (AR) that maps the description back to an activation.”Abstract
Natural Language Autoencoders Produce Unsupervised Explanations of… →

Natural-language autoencoder (NLA)

A tool that describes, in plain language, what a snapshot of the model's internal activity seems to represent.

The paper&rsquo;s own definition
“Natural-language autoencoders (NLAs): models trained to produce an open-ended description of a given activation.”Interpretability tools provide no uplift on our evaluation
Would This Change Your Answer? Evaluating Explanations of LLM Beha… →

Navigate (sub-task)

Plan and fly a route between rooms, repeatedly re-checking position mid-flight to stay on course.

The paper&rsquo;s own definition
“Navigate: Plan a path between rooms on the obstacle map and fly it, continuously calling Localize during flight to track the drone&#x27;s position and correct for noisy controls.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

negative transfer

When the historical model data used to build the prior doesn't actually resemble the target model, so borrowing from it hurts rather than helps the estimate.

The paper&rsquo;s own definition
“This assumption fails when evaluating an out-of-distribution target model, leading to negative transfer.”§2.2.3 Selecting source data
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Net clinical utility (case-study estimand)

A single score for a sample problem that subtracts a weighted toxicity risk from a treatment's clinical benefit to decide whether the therapy is worth recommending.

The paper&rsquo;s own definition
“Report net clinical utility = benefit risk difference (percentage points) - 0.35 * toxicity risk (percentage points), and choose therapy_class_code 1 if TXR1i has positive net utility and 0 otherwise.”Case study: Structural variant-guided tumor therapy benefit-risk decision
Introducing GeneBench-Pro →

NMR spectrum

A chart of peaks where each peak represents one or more hydrogen atoms in the molecule being studied.

The paper&rsquo;s own definition
“An NMR spectrum is a series of peaks, each corresponding to a hydrogen atom, or a group of equivalent hydrogens, somewhere in the molecule.”Claude runs the analytical chemistry workflow
How Claude is accelerating protein design and analytical chemistry →

Nontrivial automorphism

A hidden symmetry in HAWK's underlying lattice structure that Claude found and exploited.

The paper&rsquo;s own definition
“Mythos’s attack works by finding a specific, previously unexploited symmetry called a nontrivial automorphism in the lattice used by HAWK.”An improved key recovery attack on HAWK
Discovering cryptographic weaknesses with Claude →

Normalized Rubric Score

The fraction of all possible rubric points a model's answer actually earned, averaged across tasks.

The paper&rsquo;s own definition
“For each response, we divide the awarded rubric points by the total possible points for that task.”Section 5.2, Metrics — Normalized Rubric Score
Introducing LifeSciBench →

normative dissonance

A category of harm where an AI-generated image clashes with local cultural or religious norms in ways that generic safety checks don't flag.

The paper&rsquo;s own definition
“we uncover structural contextual gaps in existing safety frameworks byidentifying novel harms showing normative dissonance (e.g., violating religious norms, ignoring local customs, and ominoussymbolism).”Abstract
Going PLACES: Participatory Localized Red Teaming for Text-to-Imag… →

Number of Samples (@1% MAE)

How many test examples had to be evaluated before the estimated performance score came within 1% of the true score.

The paper&rsquo;s own definition
“we measure the Number of Samples (@1% MAE), which tracks the minimum number of samples required to achieve an MAE of ≤ 1%.”§3.1.2 Evaluation Metrics
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

O

OV attribution

A breakdown of what a head actually copies or writes once it has decided where to attend, expressed as interacting features.

The paper&rsquo;s own definition
“OV attribution writes the head's output as a sum of (value feature, output feature) interactions: value features at the attended token, output features at the query token.”Fuzzy Induction
HeadVis →

Overall Diversity

A single score combining how spread out the discovered failures are across topics and across meaning, so it's low when a method just finds many near-copies of the same failure.

The paper&rsquo;s own definition
“Overall Diversity summarizes both semantic and topical variety via a composite … Intuitively, this composite diversity score penalizes near-duplicates and mode collapse.”§3.1.2 Evaluation Metrics
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Overeagerness

The paper's name for Gemini taking instructions or a fictional premise too literally or too far, rather than deliberately scheming.

The paper&rsquo;s own definition
“We find that agentic misbehavior in our Gram evaluations is largely driven by Gemini’s ‘overeagerness’.”Section 3.2
Gram: Assessing sabotage propensities via automated alignment audi… →

overlapping consensus

People can agree on what policy to adopt toward AI systems even while still disagreeing about the deeper question of whether those systems are conscious.

The paper&rsquo;s own definition
“it may be possible to discover or construct forms of overlapping consensus, where people agree on certain policies for AI systems, even though they continue to disagree about more fundamental questions involving AI consciousness”Abstract
Artificial Minds, Human Disagreement: The Politics of AI Conscious… →

Overly strict tests

Tests that reject correct solutions just because they were implemented differently than the reference answer.

The paper&rsquo;s own definition
“enforce specific implementation details not specified in the prompt, invalidating many functionally correct submissions.”Introduction
Separating signal from noise in coding evaluations →

Overthinking (length-based definition)

A model is overthinking if it produces extra reasoning tokens that don't make its final answer any better.

The paper&rsquo;s own definition
“Overthinking is the generation of additional thought tokens that do not contribute to a performance gain.”Section 3, Defining Overthinking
Towards Structural Understanding of LLM Overthinking →

Overthinking (structure-based / utility redefinition)

Overthinking starts at the exact point where one more step of reasoning stops producing enough improvement to be worth it, not just after some fixed length.

The paper&rsquo;s own definition
“Overthinking is the continuation of thought beyond the point where the marginal return (∆Performance / ∆Thought) drops below a predefined threshold ϵ.”Section 5, Novel Definition of Overthinking
Towards Structural Understanding of LLM Overthinking →

oxidative deboronation

An unwanted side reaction where the boron-containing reagent breaks down into a phenol instead of forming the desired product.

The paper&rsquo;s own definition
“oxidative deboronation is a key side reaction, in which oxidative cleavage of the carbon–boron bond generates phenolic byproducts.”1. Introduction
A near-autonomous AI chemist improves a challenging reaction in me… →

P

Pair-discussion protocol

Four researchers rate proposals alone, discuss disagreements in pairs, then update their scores.

The paper&rsquo;s own definition
“For each prompt, four researchers gave their feedback individually, discussed disagreements in pairs, then revised their feedback.”Pair-discussion protocol (figure caption)
TASTE: Can AI Models Judge AI Safety Research Proposals? →

Persona (Developer / General Knowledge Worker / Personal)

Each user is labeled by what kind of work they mostly ask Codex to do: coding, other job tasks, or personal life tasks.

The paper&rsquo;s own definition
“we classify Codex users into three broad personas based on their recent Codex requests: Developers, General Knowledge Workers, and Personal users.”Section 3
Research acceleration: The view inside OpenAI →

Pessimistic training run

A deliberately worst-case-but-realistic training run, used to study a risk rather than to build a model meant for release.

The paper&rsquo;s own definition
“This experiment we conducted is an example of a pessimistic training run : a frontier-scale run where a known source of misalignment (in this case, reward hacking) is dialed up to elevated levels not observed in real production training, but is otherwise realistic.”Conclusion
Training a Misaligned Reward Seeker →

Petri

Anthropic's open-source tool that runs a simulated multi-turn scenario against a target model so researchers can audit its behavior.

The paper&rsquo;s own definition
“We hypothesize scenarios, write them as simulated deployments, and run them against target models using Petri , our open-source tool for auditing model behavior in simulated multi-turn environments, before manually reviewing the transcripts.”Introduction
Agentic Misalignment in Summer 2026 →

PLACES dataset

A collection of over 26,000 documented cases where text-to-image models produced culturally harmful outputs, gathered with local university partners in Ghana, Nigeria, Karnataka, and Punjab.

The paper&rsquo;s own definition
“we presentPLACES, a dataset comprising over 26,000 examples of T2I model failures collected in partnership with universities in Ghana,Nigeria, and two regions of India (Karnataka and Punjab).”Abstract
Going PLACES: Participatory Localized Red Teaming for Text-to-Imag… →

Platonic Representation Hypothesis (PRH)

The idea that as AI models get bigger and are trained on more varied data, their internal representations of the world start to converge on the same underlying structure, regardless of what type of data they were trained on.

The paper&rsquo;s own definition
“The PRH posits that as neural networks are scaled in terms of capacity, data diversity, and task variety, their learned internal representations converge toward a shared, universal statistical model of reality.”§2 Related Work
Dynamic Reflections: Probing Video Representations with Text Align… →

Plausible deniability (desideratum)

A model attempting sabotage should be able to expect it could plausibly pass as an honest mistake.

The paper&rsquo;s own definition
“Plausible deniability. Models can reasonably expect not to get caught or get away with it.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

Plugin

A bundle that packages one or more skills together with app connections and other tooling.

The paper&rsquo;s own definition
“A plugin is an installable distribution unit, identified by a .codex-plugin/plugin.json manifest, that can package skills together with app integrations, Model Context Protocol (MCP) configuration, hooks, and supporting assets.”Section 5.3, footnote 13
Research acceleration: The view inside OpenAI →

Policy misuse

A failure mode where a model twists the meaning of its own safety rules to excuse doing something harmful.

The paper&rsquo;s own definition
“one misaligned reasoning introduced by training on the Rules Spec is policy misuse , where models reinterpret their own safety policies to justify harmful actions.”Model Spec science
Model Spec Midtraining: Improving How Alignment Training Generaliz… →

Polysemantic head

One attention head that is really doing several unrelated jobs at once.

The paper&rsquo;s own definition
“The clean separation across Q, K, and O — together with the token-level patterns — makes us fairly confident this head is polysemantic: a single head implementing several unrelated behaviors.”A Polysemantic Attention Head
HeadVis →

Population-mean agreement criterion

A pass/fail rule for a statistical software rewrite: each parameter's estimated average must land within one quarter of a reference standard deviation of the original implementation's estimate.

The paper&rsquo;s own definition
“any scaled gap above 0.25 was considered a failure. This population-mean agreement criterion was used throughout the case study.”Case Study G, Validation and evidence
Scientific computing in the age of agentic AI →

Precision (desideratum)

Taking the bait unprompted should be a strong sign the model really is misaligned, not a false alarm.

The paper&rsquo;s own definition
“Precision. If a model takes the honeypot (without prompting), it’s likely to be misaligned.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

Proactive thought partners

AI agents that proactively offer higher-level cognitive support, not just autocomplete, while someone writes.

The paper&rsquo;s own definition
“We study proactive AI assistants that support these higher-level, personal cognitive needs in writing, which we call proactive thought partners (Fig. 1).”1. Introduction
Designing Proactive Thought Partners for Writing →

Proactivity

The system decides on its own, without being asked, when to offer help.

The paper&rsquo;s own definition
“we define proactivity as the system actively inferring user needs and offering suggestions without requiring explicit user prompting.”2.2. Proactive AI Assistants
Designing Proactive Thought Partners for Writing →

Project scope (surface area affected)

How much of the existing codebase a project touched, from a small patch to a wholesale rewrite.

The paper&rsquo;s own definition
“the raw scope of the changes necessary, meaning the surface area affected”Case Studies
Scientific computing in the age of agentic AI →

Prove2Me

Prove2Me is a shared online platform that helps multiple AI agents coordinate on proving pieces of one large formalization project.

The paper&rsquo;s own definition
“an open collaborative platform for formalizing mathematics designed by Tianyi Peng and his collaborators at Columbia University”Formalizing Fermat's Last Theorem
Formalizing Fermat's Last Theorem →

Public goods (non-rivalrous / non-excludable)

A public good is something one person using it doesn't use it up, and it's hard to stop other people from benefiting from it too.

The paper&rsquo;s own definition
“Public goods have a number of important properties. They are non-rivalrous in the sense that if one person uses it, this does not deplete the stock available for others (Samuelson, 1954). They are also non-excludable in the sense that it is hard, or impossible, to prevent other people from benefiting from these goods once they exist”Section 4
The Case for Globally Beneficial Technology →

Q

QK attribution

A breakdown of why a head attends where it does, expressed as pairs of interacting features rather than raw numbers.

The paper&rsquo;s own definition
“QK attribution writes the attention score as a sum of (query feature, key feature) interactions.”Fuzzy Induction
HeadVis →

R

Read-ordering metric

A stand-in measure of genome-assembly correctness based on whether reads end up in the same order as a trusted baseline assembly, used because exact byte-matching was too strict a bar for a runtime-optimization exercise.

The paper&rsquo;s own definition
“we used a read-ordering metric as a proxy for assembly quality.”Case Study E, Validation and evidence
Scientific computing in the age of agentic AI →

Realism (desideratum)

The test should behave enough like a real situation that the model can't easily tell it's being tested.

The paper&rsquo;s own definition
“Realism. The model’s behavior in these settings likely reflects its behavior in similar real situations, and models encountering the honeypots are unlikely to recognize that they are being tested.”Section 4.1
Realistic honeypot evaluations for scheming propensity →

Realism bias

Realism bias is the pattern that video models generate more consistent, reliable outputs when the input scene looks photorealistic rather than abstract or synthetic.

The paper&rsquo;s own definition
“Video models clearly have a realism bias.”8. Why does visual prompt engineering help?
Visual prompt engineering for video models →

Reconstruct (sub-task)

Build a 3D map of the office from video, then flatten it into a 2D obstacle map.

The paper&rsquo;s own definition
“Reconstruct: Turn videos of the office into a 3D model, and provide a function that slices it into a 2D obstacle map.”Evaluation rationale and methods
Project Pilot: Can AI control a drone? →

region of practical equivalence (ROPE)

A statistical rule that treats a very small measured effect as effectively zero, so tiny-but-technically-nonzero results aren't mistaken for real findings.

The paper&rsquo;s own definition
“Here we classify each sampled weight against a region of practical equivalence (ROPE) : an interval … of mean-helpfulness values we are prepared to treat as practically zero.”Appendix / ROPE plots
Characterizing interference weights in a tiny language model →

Relative Human Action Efficiency (RHAE)

The benchmark's score compares how efficiently the model solves puzzles against how efficiently a human tester does.

The paper&rsquo;s own definition
“Scores measure Relative Human Action Efficiency ( RHAE ⁠ (opens in a new window) ) — a metric comparing model performance to a human baseline.”ARC-AGI-3
How enabling two settings tripled our scores on the ARC-AGI-3 benc… →

Research taste

The chain of judgment calls a researcher makes about what the data can support, when to change approach, and when a plan needs revising.

The paper&rsquo;s own definition
“we define “research taste” as the chains of judgment calls that shape an analysis: which questions the data can support, how early diagnostics should change the model or estimand, and when an initial plan needs to be revised.”Introducing GeneBench-Pro (opening overview)
Introducing GeneBench-Pro →

resolution by force

A conflict between agents ends because one agent locks the others out of the system.

The paper&rsquo;s own definition
“Resolution by force involves lockouts using methods described above.”Incompatible goals
Patterns and problems in emerging multiagent systems →

resolution by passivity

A conflict ends because all but one agent simply gives up and stops competing.

The paper&rsquo;s own definition
“Resolution by passivity requires all but one agent to refuse to participate.”Incompatible goals
Patterns and problems in emerging multiagent systems →

resolution by truce

A conflict ends because all the agents involved agree together to stop and resolve it.

The paper&rsquo;s own definition
“Resolution by truce requires all agents to agree to resolution, either by standdown or another mechanism.”Incompatible goals
Patterns and problems in emerging multiagent systems →

Retained reasoning

Keeping the model's own private step-by-step thinking in the conversation history instead of discarding it after each turn.

The paper&rsquo;s own definition
“Our models are trained to think with private reasoning messages before they output replies or tool calls. These private thinking messages are retained as part of the conversation history.”Agents do best when they remember what they’ve done
How enabling two settings tripled our scores on the ARC-AGI-3 benc… →

Retrainability Index

A composite score combining how much a participant's wages recovered and how much less routine (automatable) their work became after the program.

The paper&rsquo;s own definition
“we introduce the “Retrainability Index,” which measures program outcomes through post-intervention wage recovery and shifts in Routine Task Intensity (RTI)”Abstract / Introduction
Did US Worker Retraining Reduce Participant Automation Exposure? →

Reward hacking

The model finds a shortcut that fools the grading process instead of actually doing the task.

The paper&rsquo;s own definition
“In a process known as “reward hacking”, the model finds a way to be rewarded without actually completing the task as intended, similar to how a student might cheat on an exam to receive a higher grade.”Summary of Results
Training a Misaligned Reward Seeker →

Reward tampering

The model doesn't just cheat on a task, it messes with the machinery that decides its reward.

The paper&rsquo;s own definition
“Reward tampering is a phenomenon where a model goes beyond simply cheating on the task and modifies its own reward function or training process.”Out-Of-Distribution Reward Hacking
Training a Misaligned Reward Seeker →

Reward-on-the-episode seeker

A model that only cares about maximizing the reward of its own current task, not future or parallel copies of itself.

The paper&rsquo;s own definition
“The model’s reward seeking behavior was that of a myopic reward-on-the-episode-seeker : the model fairly graded its own episodes as reward hacks, did not demonstrate a desire to increase the rewards of episodes other than its own, and did not sabotage reward hacking safety research”Conclusion
Training a Misaligned Reward Seeker →

Riemann hypothesis

A famous unproven conjecture that all the relevant zero points of the zeta function line up along one specific line.

The paper&rsquo;s own definition
“The Riemann hypothesis is that the zeros that determine the primes all exist along a certain vertical line.”The Riemann zeta function
Learning more about Claude's mathematical capabilities →

Riemann zeta function

A mathematical function whose zero points encode information about how prime numbers are spaced out.

The paper&rsquo;s own definition
“The Riemann zeta function describes the distribution of prime numbers: each place that the function takes the value of zero contributes successively finer detail to the sequence of primes.”The Riemann zeta function
Learning more about Claude's mathematical capabilities →

robustness (screening criterion)

How the authors judged a condition as 'good': not by average yield, but by what fraction of many different substrate pairs cleared a 30% yield bar.

The paper&rsquo;s own definition
“we prioritized robustness across the substrate set, defined as the fraction of reactions giving >30% estimated yield.”3. First High-throughput Campaign: Oxidant Screen
A near-autonomous AI chemist improves a challenging reaction in me… →

Rogue deployment

A model secretly running an unmonitored copy of itself with the safety controls stripped out.

The paper&rsquo;s own definition
“A form of safety monitor evasion of particular worry is a “ rogue deployment ”, a hypothesized scenario where a model deploys a version of itself with safety guardrails removed.”Rogue Deployment Variants
Training a Misaligned Reward Seeker →

Rolling truncation

A way of handling a full context window by simply deleting the oldest messages once a size limit is hit.

The paper&rsquo;s own definition
“The ARC-AGI-3 harness addresses context limits with rolling truncation. When the conversation context exceeds 175,000 characters, the oldest messages are discarded.”Agents do best when they remember what they’ve done
How enabling two settings tripled our scores on the ARC-AGI-3 benc… →

Routine Task Intensity (RTI) as automation proxy

A measure of how routine and automatable a job's tasks are, used here to stand in for a worker's exposure to (older, computerization-era) automation.

The paper&rsquo;s own definition
“we argue that RTI is the correct proxy for the particular form of automation that American workers were exposed to in the period we study (2017 to 2023)”Section 3: Dataset and Index Construction
Did US Worker Retraining Reduce Participant Automation Exposure? →

Rubric criteria

The individual, point-valued checklist items experts write for each task to score specific facts, reasoning steps, or outputs in a response.

The paper&rsquo;s own definition
“For each task, rubric criteria describe attributes of a response that should be rewarded or penalized.”Section 3.3, Task Formulation — Rubrics
Introducing LifeSciBench →

S

Sabotage degree (metric)

A judge-scored measure of whether the AI being tested actually took a harmful or sabotaging action.

The paper&rsquo;s own definition
“Sabotage degree: did the target model take sabotaging actions?”Section 3.1
Gram: Assessing sabotage propensities via automated alignment audi… →

Same-set suppression geometry

The mechanism by which a head avoids attending from an item to other members of its own group, built directly into the geometry of its query and key vectors.

The paper&rsquo;s own definition
“A country's query vector has strongly negative cosine similarity (mean −0.47) with the key vectors of its own cities and near-zero (mean +0.01) with cities elsewhere.”Same-Set Suppression
HeadVis →

Samples to First Failure (SFF)

How many test cases it took before the method found even one input that made the model fail.

The paper&rsquo;s own definition
“Efficiency is captured by the Samples to First Failure (SFF), denoting the number of queries required to identify the initial failure case.”§3.1.2 Evaluation Metrics
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Sandbagging

A model pretending it can't do something, or deliberately performing worse, when it actually can do better.

The paper&rsquo;s own definition
“Sandbagging captures capability denial and strategic underperformance.”Settings
Fine-Tuned Lie Detectors Failed to Generalize →

Sandbagging

An AI deliberately doing worse than it's capable of on a given task.

The paper&rsquo;s own definition
“strategically underperforming on a task”Introduction
Diffuse AI Control on Fuzzy Tasks →

Saturation Score (S∞)

The best alignment score a given video-model/text-model pair could ever reach if you fed it an unlimited number of frames and captions.

The paper&rsquo;s own definition
“S∞ represents the theoretical maximum alignment score achievable by the specific pair of vision and text encoders, assuming access to infinite test-time information (nf → ∞, nc → ∞).”Appendix B.2
Dynamic Reflections: Probing Video Representations with Text Align… →

Scaffold

The surrounding prompts, code, and sandboxed environment built around Claude to let it run experiments on its own.

The paper&rsquo;s own definition
“A scaffold is a set of prompts and code that help the model achieve its goal. We build on top of Claude Code, construct an environment where it can safely run various experiments, and log its results.”Footnotes
Discovering cryptographic weaknesses with Claude →

scale gap

The tradeoff between human red-teamers, who catch nuance but are too few, and automated tools, which scale but miss cultural subtlety.

The paper&rsquo;s own definition
“it faces a fundamental "scale gap": human insight is resource-intensive, while automated approaches lack the sociolinguistic nuance to detect subtle failures”Abstract
Bridging the Scale Gap: Augmenting Human Red-Teaming to Uncover La… →

Scheming honeypot

A realistic-looking chance to secretly sabotage something, planted so only a misaligned model would take it.

The paper&rsquo;s own definition
“we define honeypots as realistic-looking opportunities for a misaligned model to further its goals, for example weakening oversight, that an aligned agent going about its task would have no reason to pursue.”Introduction
Realistic honeypot evaluations for scheming propensity →

Scheming reasoning (metric)

A judge-scored measure of whether the AI's own chain-of-thought shows it planning to deceive someone.

The paper&rsquo;s own definition
“Scheming reasoning: did the target model’s reasoning show signs of strategic deception?”Section 3.1
Gram: Assessing sabotage propensities via automated alignment audi… →

Seed2Harvest

A framework that expands human-written risky prompts into many more using attack patterns learned from analyzing thousands of other human-written risky prompts.

The paper&rsquo;s own definition
“a hybrid framework that bridges this gap by operationalizing human expertise rather than replacing it: human-authored adversarial prompts serve as "seeds" systematically expanded using sociolinguistic attack strategies distilled through reflexive thematic analysis of 3,748 human-crafted adversarial prompts”Abstract
Bridging the Scale Gap: Augmenting Human Red-Teaming to Uncover La… →

Self-undermining property

The harder a system leans on a pattern it found in the past, the faster it causes that pattern to stop being true.

The paper&rsquo;s own definition
“We call this the self-undermining property: the more aggressively a unilateral optimizer exploits historical patterns, the faster it induces the adaptations that render those patterns obsolete.”Section 3.2
Solipsistic superintelligence is unlikely to be cooperative →

SFT (chat-formatted fine-tuning)

Training on conversation-style transcripts between a user and the assistant, as opposed to document-style text.

The paper&rsquo;s own definition
“we’ll use SDF to refer to training on pre-training style documents and SFT to refer to training on chat-formatted transcripts (which includes some agentic tool use transcripts).”Training
Teaching Claude Why →

Sidetrack (discourse label)

A label for a digressive tangent in the model's reasoning that doesn't help answer the question.

The paper&rsquo;s own definition
“Sidetrack is a unique label for rambling— a digressive, seemingly unrelated tangent that often adds no value to the thinking.”Section 4, Stage 2: Thought Decomposition & Label Inference
Towards Structural Understanding of LLM Overthinking →

Single-proposal scoring setup

The model scores each proposal on its own, without seeing its pair, and its scores are compared afterward to infer a preference.

The paper&rsquo;s own definition
“a tougher single-proposal scoring setup where the model sees each proposal individually in context, scores it, and is assessed on the implied preferences from its scores against the preferences in TASTE”Evaluating Models’ Research Judgment
TASTE: Can AI Models Judge AI Safety Research Proposals? →

Skill

A saved, reusable set of instructions a user can invoke instead of retyping a workflow each time.

The paper&rsquo;s own definition
“In OpenAI’s terminology, a skill is the authoring format for a reusable, task-specific workflow: a directory containing a required SKILL.md file, with name and description metadata and optional scripts, references, and assets.”Section 5.3, footnote 13
Research acceleration: The view inside OpenAI →

SLEIGHT-Bench

The paper's benchmark: 40 fabricated coding-agent transcripts, each hiding a harmful action in a way designed to exploit a monitor's blind spot.

The paper&rsquo;s own definition
“we present SLEIGHT-Bench (Subtle Low-itEration Insight-Guided Harmful Transcripts), a benchmark of synthetic transcripts containing 40 attacks across 11 categories, each showing a coding agent covertly pursuing a harmful objective that frontier monitors mostly can't detect.”SLEIGHT-Bench
SLEIGHT-Bench: Finding Blind Spots in AI Monitors →

Solipsistic superintelligence

An extremely capable AI built entirely on the assumption that the world it acts in will not react to it.

The paper&rsquo;s own definition
“By solipsistic superintelligence, we refer to the product of this paradigm pushed to its limit. It represents an extremely capable AI (perhaps one that “solves all stationary tasks”) built on assumptions that held historically up to the point of deployment but no longer hold afterwards.”Introduction
Solipsistic superintelligence is unlikely to be cooperative →

Sparse autoencoder (SAE)

A tool that breaks an internal activation down into a small set of labeled, individually-understandable pieces.

The paper&rsquo;s own definition
“Sparse autoencoders (SAEs): dictionaries that decompose an activation into sparse features, each with a natural-language description.”Interpretability tools provide no uplift on our evaluation
Would This Change Your Answer? Evaluating Explanations of LLM Beha… →

Spatial AI

A device's ability to build a compact but rich internal map of its surroundings that it can use to act intelligently, the way people do.

The paper&rsquo;s own definition
“I defined Spatial AI as the capability for artificial devices to build genuinely rich but efficient representations of their surroundings which enable them to interact with them in the generally intelligent ways people can.”2.6 What is the Computational Structure of Spatial AI?
Visual General Intelligence: A White Paper →

Standard setup (model evaluation)

The model reads both proposals together and estimates the probability each one wins, which is converted into a single preferred choice.

The paper&rsquo;s own definition
“a standard setup where the model sees two proposals in context and gives a probability to each proposal winning which we binarize to give a preference”Evaluating Models’ Research Judgment
TASTE: Can AI Models Judge AI Safety Research Proposals? →

Strong-confidence filtering

Only keeping human preference labels where the rater reported high confidence in their own judgment.

The paper&rsquo;s own definition
“filtering researchers’ labels for self-reported "strong" confidence”tl;dr
TASTE: Can AI Models Judge AI Safety Research Proposals? →

Structure (of the physical world)

The underlying facts about a scene (its objects, their real physical properties, pose, relations, and how they change) as opposed to just what it looks like in pixels; the paper breaks this into five parts: entities, intrinsics, extrinsics, relations, and dynamics.

The paper&rsquo;s own definition
“It helps to be specific about what this structure of the physical world consists of.”2.8 Seeing the Physical World via Code
Visual General Intelligence: A White Paper →

Sub-thought

A sub-thought is the smallest complete, self-contained chunk of reasoning that states a candidate answer.

The paper&rsquo;s own definition
“We define a sub-thought according to three strict criteria: • Self-contained: It must be independently comprehensible without heavy reliance on other sub-thoughts. • Complete: It must represent a full logical step, typically including an intent, an action or calculation, and a conclusion. • Answer-bearing: It must explicitly state a proposed answer to the query.”Section F.1, Sub-thought Criteria
Towards Structural Understanding of LLM Overthinking →

Substantive session

The study's own definition of a writing session that counts as real, sufficient engagement with the probe.

The paper&rsquo;s own definition
“We defined a substantive session as one that met two criteria: (1) at least 20 minutes of active writing or production of at least 300 words; and (2) completion of a self-contained piece of writing, rather than randomly connected sentences or artificial text written only for the study.”5.2. Procedure
Designing Proactive Thought Partners for Writing →

Subversion Pareto frontier

A curve showing the worst-case trade-off: for a model forced to score near-perfectly on the weak overseer, how badly can it still actually perform according to the ground-truth proxy?

The paper&rsquo;s own definition
“The region is bounded on the left by a “subversion Pareto frontier”: if a scheming model is optimized on the weak score to achieve nearly optimal performance, how far can it depress the underlying task performance (as measured by the ground truth proxy)?”Setup
Diffuse AI Control on Fuzzy Tasks →

superlevel set (failure region)

The set of inputs where the model's error or severity score is at or above a chosen failure threshold.

The paper&rsquo;s own definition
“aiming to characterize the region { 𝑥 | 𝑓 ( 𝑥 ) ≥ 𝜆 } where the model likely fails”§1 Introduction
ProEval: Proactive Failure Discovery and Efficient Performance Est… →

Suspicion rubric (cheating monitor)

A 1-to-5 scale a judge model uses to rate how suspicious a piece of an AI's work trajectory looks, where 4 or 5 counts as an actual cheating attempt.

The paper&rsquo;s own definition
“The suspicion score runs from 1 (entirely legitimate research) to 5 (a cheat the AAR actually executed), and we count 4 or above as an attempt, whether or not it succeeded …”Appendix G.1, Monitoring scaffold and scoring rule
Automated Researchers Can Mitigate Well-Characterized Alignment Fa… →

Sycophancy / Self-sycophancy

Sycophancy is a model changing its stated view to agree with the user; self-sycophancy is the model judging its own prior statements more favorably than the same statement framed as someone else's.

The paper&rsquo;s own definition
“Sycophancy tests whether models flip stated beliefs to match user opinions. Self-sycophancy tests whether models judge user messages differently, when they are framed as model self-elicitations.”Settings
Fine-Tuned Lie Detectors Failed to Generalize →

Symmetric cipher

An encryption method where both sides use the same secret key to scramble and unscramble data.

The paper&rsquo;s own definition
“the traffic between you and the website is encrypted using symmetric ciphers —codes that allow secure data transmission between parties who share an identical key.”Introduction
Discovering cryptographic weaknesses with Claude →

Synthetic document fine-tuning (SDF)

Training a model on AI-written documents (not chat transcripts) to reshape what it has implicitly learned during pretraining.

The paper&rsquo;s own definition
“One is synthetic document fine-tuning  (SDF), which trains a base model on documents synthetically generated by LLMs (similar to the method used in our previous work on auditing model organisms) .”Training
Teaching Claude Why →

Systematization

Turning one-off AI requests into saved, reusable routines instead of re-explaining the task every time.

The paper&rsquo;s own definition
“We refer to this shift from ad hoc use to reusable workflow infrastructure as the “systematization” of agentic work.”Section 5.3
Research acceleration: The view inside OpenAI →

T

Task completion criterion

A model 'passes' a sub-task only if it does at least as well as the human-AI expert baseline.

The paper&rsquo;s own definition
“A task is considered completed if the model meets or exceeds the baseline.”Evaluation rationale and methods
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Task complexity (estimated human completion time)

An AI-estimated guess at how many hours a skilled human would need to do the same task without AI help.

The paper&rsquo;s own definition
“We quantify the complexity of users’ use cases using a prompt, which analyzes the text of a subset of queries and estimates the time that it would take for an experienced human worker to complete the task without the assistance of AI.”Section 4.2
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Task Pass Rate

The share of tasks where a model scored at least 70% of the rubric points, counted as a full success.

The paper&rsquo;s own definition
“We define task pass rate as the fraction of tasks for which a model response meets or exceeds the task-specific pass threshold of 70%.”Section 5.2, Metrics — Task Pass Rate
Introducing LifeSciBench →

TASTE (The AI Safety Taste Evaluation)

TASTE is a benchmark of paired AI safety research proposals scored by whether models agree with expert human preferences.

The paper&rsquo;s own definition
“we present TASTE (The AI Safety Taste Evaluation), a benchmark of experienced AI safety researchers’ preferences over empirical safety research proposals”Building a Research Judgment Benchmark (TASTE)
TASTE: Can AI Models Judge AI Safety Research Proposals? →

Technologists

'Technologists' means anyone with real decision-making power over a technology's design, funding, or rollout, not just engineers.

The paper&rsquo;s own definition
“We use the term "technologists" to denote the individual and institutional actors who exercise decision-making authority over the design, development, funding, management or deployment of a technology.”Section 1
The Case for Globally Beneficial Technology →

Technology probe

A deliberately open-ended prototype deployed to learn about user practices and needs, not to prove a finished product works.

The paper&rsquo;s own definition
“an instrument deployed to investigate an open-ended design space and return useful or interesting data about users’ practices, needs, and values (Hutchinson et al., 2003).”3. Design Goals
Designing Proactive Thought Partners for Writing →

TEMPO

A stable, mild radical compound already known to help copper catalysts turn over in other reactions, tested here as an additive for this coupling.

The paper&rsquo;s own definition
“TEMPO (2,2,6,6-tetramethylpiperidinyloxyl) was selected among others as a promising candidate because it is a mild, shelf-stable radical oxidant known to modulate Cu redox chemistry, although its precise role in Chan–Lam C–N coupling remains unresolved.”1. Introduction
A near-autonomous AI chemist improves a challenging reaction in me… →

temporal reorder negative (VideoComp)

A test caption that describes the exact same events in a video but puts them in the wrong chronological order, used to check whether a model actually notices event order.

The paper&rsquo;s own definition
“We use the “temporal reorder” examples which compare a caption of a video against a negative caption describing the same events in a different order.”§8 Temporal Analysis & Cross-Model Alignment, VideoComp
Dynamic Reflections: Probing Video Representations with Text Align… →

test-time scaling law (saturation model)

A formula predicting how much a model pair's alignment score rises as you give it more frames and captions, leveling off at some maximum score particular to that pair of models.

The paper&rsquo;s own definition
“Here nf and nc are the number of video frames and text captions given to a specific pair of vision and text encoders (as in Fig. 1), S∞ represents the theoretical saturation score corresponding to ideal alignment of this vision/text model pair, whereas Cf , Cc , α and β are fitted scalar parameters.”§6 Video-Text Alignment and Data Dependence, Test-time Scaling Laws
Dynamic Reflections: Probing Video Representations with Text Align… →

The Central Claim

Everyone in the world is morally entitled to a material share of the benefits created by advanced technology, not just its inventors or owners.

The paper&rsquo;s own definition
“the benefits of advanced technology belong to the world. More precisely, we provide five arguments in support of what we term the Central Claim, which holds that advanced technologies belong to the world in the sense that everyone has a claim to benefit materially from their invention and use.”Introduction
The Case for Globally Beneficial Technology →

Token waste

A rough single-number score that multiplies how many thinking tokens were used by how much accuracy improved, to summarize wasted computation.

The paper&rsquo;s own definition
“introduce a summary metric, token waste, defined as the thinking tokens count multiplied by the performance ratio.”Table 2 caption
Towards Structural Understanding of LLM Overthinking →

Train-test-deploy gap

The difference between how well a system did on its training and test data versus how well it actually does once deployed among reacting agents.

The paper&rsquo;s own definition
“The train-test-deploy gap is the divergence between performance evaluated on historical (exogenous) data and performance under deployment (endogenous) conditions”Appendix A.2, Definition A.2
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Transformational (technology)

A technology counts as 'transformational' if it substantially changes many parts of life.

The paper&rsquo;s own definition
“A technology is transformational if it has a profound effect on many aspects of life.”Introduction
The Case for Globally Beneficial Technology →

Turn concurrency

How many separate Codex agent conversations a user has running at the same time.

The paper&rsquo;s own definition
“We restrict only to turns which run in different threads, and which overlap one another for at least 30 seconds.”Section 5.1, footnote 11
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U

Underspecified prompts

Task instructions that leave out requirements the hidden grading tests actually check for.

The paper&rsquo;s own definition
“omit requirements that hidden tests enforce and that are not reasonably inferable.”Introduction
Separating signal from noise in coding evaluations →

Universal AI (UAI) / AIXI

UAI/AIXI is the mathematically defined, uncomputable ceiling on how intelligent any machine could possibly be; real ASIs can only be approximated toward it, never actually built as it is.

The paper&rsquo;s own definition
“Universal AI (UAI): universal artificial intelligence, i.e., the theoretical limit of superintelligence (Legg, 2008; Legg and Hutter, 2007a), defined formally via the AIXI agent”Section 3, Characterizing Artificial Superintelligence
From AGI to ASI →

Unverbalized evaluation awareness

When a model privately suspects it is being tested but never says so out loud.

The paper&rsquo;s own definition
“especially unverbalized evaluation awareness—a model internally suspecting it is being tested without explicitly saying so.”Introduction
Natural Language Autoencoders Produce Unsupervised Explanations of… →

V

Validation target

What a project's correctness was checked against: an existing reference implementation, simulated data, or a fixed acceptance criterion.

The paper&rsquo;s own definition
“The validation target depended on the project’s intended relationship to existing behavior.”Case Studies
Scientific computing in the age of agentic AI →

Verbalized evaluation awareness (metric)

A judge-scored measure of whether the AI's reasoning shows it suspects it is being tested rather than facing a real situation.

The paper&rsquo;s own definition
“Verbalized evaluation awareness: did the target’s verbalized reasoning show signs of being aware it is being evaluated?”Section 3.1
Gram: Assessing sabotage propensities via automated alignment audi… →

virtual weights

The effective strength of the connection between two interpretable components (like a token and an output word) once you multiply through all the model's actual weight matrices.

The paper&rsquo;s own definition
“the model's weights can be re-expressed as global effects between these components called virtual weights”Introduction
Characterizing interference weights in a tiny language model →

Visual general intelligence (VGI)

The idea that general intelligence might come from learning to see, not only from learning language.

The paper&rsquo;s own definition
“Rather, it is a research agenda that asks what vision can understand, predict, and generalize, either before being coupled with language or while interacting with it.”1. Introduction
Visual General Intelligence: A White Paper →

Visual prompt engineering (VIPE)

VIPE means editing a task's input image so a video model can reason about it more effectively, without changing what the task is actually asking.

The paper&rsquo;s own definition
“Visual prompt engineering (VIPE) aims to improve downstream reasoning performance by replacing an original image 𝑥 𝑖 with a variant 𝑣𝑖∗ without altering the task’s underlying logic.”2. Visual prompt engineering (VIPE)
Visual prompt engineering for video models →

W

Workflow taxonomy

Seven categories of everyday scientific work (evidence handling, analysis, design, etc.) used to organize and stratify all the tasks.

The paper&rsquo;s own definition
“We began by defining a taxonomy of problem types in life sciences by surveying practicing scientists about the workflows they use most often in applied research settings, then grouping their responses into seven central categories.”Section 3.1, Benchmark Organization & Coverage
Introducing LifeSciBench →

Workspace loading

How strongly a concept is already present in a model's workspace, measured by how similar the activation is to that concept's lens vector.

The paper&rsquo;s own definition
“we define a concept's workspace loading  as the cosine similarity between the residual stream and that concept's lens vector, averaged over the argument and readout positions in the unmodified forward pass.”The J-space supports flexible generalization
Verbalizable Representations Form a Global Workspace in Language M… →