{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Reasoning Models Dont Say Think","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c","json_url":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c/signal.json","generated_at":"2026-06-11T04:16:54.563548+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c","signal_json":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c/signal.json","source":"https://www.anthropic.com/research/reasoning-models-dont-say-think","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":"https://onlylabs.fyi/topics/talking","topic_signals_json":"https://onlylabs.fyi/topics/talking/signals.json","topic_feed":"https://onlylabs.fyi/topics/talking/feed.xml","data_business":null},"answer_pack":{"answer":"Anthropic published Reasoning Models Dont Say Think. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Reasoning models don't always say what they think \\ Anthropic Alignment Reasoning models don't always say what they think Apr 3, 2025 Read the paper Since late.... onlylabs links this event to 1 captured evidence page and 6 related writing signals.","signal_desk":"talking","source_context":{"source_url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","source_host":"anthropic.com","occurred_at":"2025-04-03T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date","context":null},"context_markers":[{"label":"Lab","value":"Anthropic","source":"signal"},{"label":"Signal desk","value":"talking","source":"signal"},{"label":"Source host","value":"anthropic.com","source":"source"},{"label":"Watch term","value":"Eval methodology","source":"evidence"},{"label":"Watch term","value":"Infrastructure","source":"evidence"},{"label":"Watch term","value":"Safety and 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narrative layer over raw signals and helps identify which frontier-lab priorities are becoming externally legible.","required_sources":[{"label":"signal_json","url":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c/signal.json","required":true},{"label":"source","url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","required":true},{"label":"dossier_json","url":"https://onlylabs.fyi/labs/anthropic/dossier.json","required":true},{"label":"analysis_evidence_json","url":"https://onlylabs.fyi/analysis/anthropic/evidence.json","required":true},{"label":"topic_signals_json","url":"https://onlylabs.fyi/topics/talking/signals.json","required":false},{"label":"data_radar_json","url":null,"required":false}],"expected_output":["one-paragraph source-grounded interpretation","category-specific implication","confidence and missing evidence","recommended next source to inspect"],"prompt_seed":"Using only the linked onlylabs JSON, captured source context, and 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This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Reasoning models don't always say what they think \\ Anthropic Alignment Reasoning models don't always say what they think Apr 3, 2025 Read the paper Since late.... onlylabs links this event to 1 captured evidence page and 6 related writing signals.","semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Reasoning Models Dont Say Think","text":"Anthropic published Reasoning Models Dont Say Think."},{"subject":"Reasoning Models Dont Say Think","predicate":"is classified as","object":"writing signal","text":"Reasoning Models Dont Say Think is classified as writing signal."},{"subject":"Reasoning Models Dont Say Think","predicate":"belongs to","object":"talking desk","text":"Reasoning Models Dont Say Think belongs to talking desk."},{"subject":"Reasoning Models Dont Say Think","predicate":"has evidence coverage","object":"1 captured evidence page","text":"Reasoning Models Dont Say Think has evidence coverage 1 captured evidence page."}]},"signal":{"id":"58c2fc05-b06a-45d6-8d93-0f0c8228bf8c","url":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c","json_url":"https://onlylabs.fyi/signals/58c2fc05-b06a-45d6-8d93-0f0c8228bf8c/signal.json","source_url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","title":"Reasoning Models Dont Say Think","summary":"Anthropic published a writing signal. onlylabs watches public writing for research themes, product direction, and model-launch context.","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2025-04-03T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date","evidence_coverage":{"target_pages":1,"captured_pages":1,"readable_pages":1,"capture_methods":["plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://www.anthropic.com/research/reasoning-models-dont-say-think"]},"facets":{},"traction":{"github_stars":null,"hn_points":null,"hn_comments":null,"hn_story_id":null,"hf_downloads":null,"hf_likes":null},"data_radar":null},"primary_evidence_page":{"url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","final_url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","title":"Reasoning Models Dont Say Think","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T04:16:54.563548+00:00","bytes":145921,"raw_path":"763973bbed381f66e986b4c0551334aae0cd7389287b9ceaf56243b801e77a74.html","content_hash":"8942899a31201b04862a462ad3563c98cb41c0223114570b939526af2d1d5962","excerpt_chars":1200,"truncated":true,"excerpt":"Reasoning models don't always say what they think \\ Anthropic Alignment Reasoning models don't always say what they think Apr 3, 2025 Read the paper Since late last year, “reasoning models” have been everywhere. These are AI models—such as Claude 3.7 Sonnet—that show their working : as well as their eventual answer, you can read the (often fascinating and convoluted) way that they got there, in what’s called their “Chain-of-Thought”. As well as helping reasoning models work their way through more difficult problems, the Chain-of-Thought has been a boon for AI safety researchers. That’s because we can (among other things) check for things the model says in its Chain-of-Thought that go unsaid in its output, which can help us spot undesirable behaviours like deception. But if we want to use the Chain-of-Thought for alignment purposes, there’s a crucial question: can we actually trust what models say in their Chain-of-Thought? In a perfect world, everything in the Chain-of-Thought would be both understandable to the reader, and it would be faithful —it would be a true description of exactly what the model was thinking as it reached its answer. But we’re not in a perfect..."},"evidence_pages":[{"url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","final_url":"https://www.anthropic.com/research/reasoning-models-dont-say-think","title":"Reasoning Models Dont Say Think","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T04:16:54.563548+00:00","bytes":145921,"raw_path":"763973bbed381f66e986b4c0551334aae0cd7389287b9ceaf56243b801e77a74.html","content_hash":"8942899a31201b04862a462ad3563c98cb41c0223114570b939526af2d1d5962","excerpt_chars":1200,"truncated":true,"excerpt":"Reasoning models don't always say what they think \\ Anthropic Alignment Reasoning models don't always say what they think Apr 3, 2025 Read the paper Since late last year, “reasoning models” have been everywhere. These are AI models—such as Claude 3.7 Sonnet—that show their working : as well as their eventual answer, you can read the (often fascinating and convoluted) way that they got there, in what’s called their “Chain-of-Thought”. As well as helping reasoning models work their way through more difficult problems, the Chain-of-Thought has been a boon for AI safety researchers. That’s because we can (among other things) check for things the model says in its Chain-of-Thought that go unsaid in its output, which can help us spot undesirable behaviours like deception. But if we want to use the Chain-of-Thought for alignment purposes, there’s a crucial question: can we actually trust what models say in their Chain-of-Thought? In a perfect world, everything in the Chain-of-Thought would be both understandable to the reader, and it would be faithful —it would be a true description of exactly what the model was thinking as it reached its answer. 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