trailSparse autoencoders are powerful tools for discovering previously unknown concepts represented in language models.
When do sparse autoencoders and related dictionary-learning methods outperform other methods for discovering language-model properties?
The argument from discovery case studies· for
Claude 3.5 Haiku represents a couplet's intended rhyme word before generating its second line.
atomic
In Anthropic's reward-model-sycophancy audit, sparse-autoencoder tools improve automated agents' objective-discovery success over chat and training-data search tools alone.
atomic
The argument from matched comparisons with simpler methods· against
On AuditBench, logit-lens and sparse-autoencoder tools provide little benefit across tested target-model types.
bedrock · fact
In API-only model diffing, an improved LLM baseline performs comparably to SAE-based methods and surfaces more abstract behavioral differences.
atomic
In Anthropic's 2025 blind auditing game, embedding-based search could have replicated the fastest team's SAE-based document discovery.
atomic
claim · evaluativeA judgment of worth or quality against some standard: good, fair, effective.constitution →claim page ↗︎
Sparse autoencoders are powerful tools for discovering previously unknown concepts represented in language models.
⇄InconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →
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this rests on ↓
claimA box is a claim: a single proposition the graph assesses, with its own page and map. Click any claim to centre the map on it.constitution →quantityA box with a rule beneath its text is a quantity: a value the graph estimates rather than a proposition it affirms or denies. Its estimate stands where a claim's status would.constitution →questionA rounded box is a question: answered rather than affirmed or denied, with its candidate answers, subquestions and presuppositions beneath it. Its mark says how well answered it is.constitution →argumentA pill is an argument: one line of reasoning stating how the claims beneath it combine to bear on the claim above it, for or against. Click one to see its reasoning and open its page.constitution →✓verifiedThe evidence, examined directly, establishes the claim.constitution →↑supportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →⇄inconclusiveThe evidence and argument have been examined and do not come down on either side.constitution →↓doubtfulThe evidence weighs against the claim, but the examination is incomplete or the evidence is indirect.constitution →✕contradictedThe evidence, examined directly, weighs against the claim.constitution →?unknownInsufficient information to assess.constitution →◌unassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →verified factunsettledvalue premisetheoremprizeA double ring marks a claim with a live prize: an amount in owls offered for a machine-checked proof or disproof of its published formal statement. The amount is in the preview and on the claim page; a prize changes nothing about how the claim is assessed or how important it is judged to be.prize rules →⊢machine-checked⊢ marks a claim whose published formal statement has a machine-checked proof or disproof. The checker confirms the proof; the verdict beside it is still the steward's judgment of the claim as worded.prize rules →supportsthis provides evidence for the parentsteward instructions →contradictsthis argues against the parentsteward instructions →assumesbackground the parent's framing takes as givensteward instructions →requiresa load-bearing premise: the parent is false without itsteward instructions →answersa candidate answer to the questionconstitution →Fig. Detail falls off with distance; every claim is an address.