{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Investigating Incidents Cybersecurity Evals","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/be6c95ea-2625-4c21-84e6-b55966f746dc","json_url":"https://onlylabs.fyi/signals/be6c95ea-2625-4c21-84e6-b55966f746dc/signal.json","generated_at":"2026-09-09T21:08:08.589Z","evidence_latest_fetched_at":"2026-07-31T00:03:25.796+00:00","signal_first_seen_at":"2026-07-31T00:01:43.835015+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/be6c95ea-2625-4c21-84e6-b55966f746dc","signal_json":"https://onlylabs.fyi/signals/be6c95ea-2625-4c21-84e6-b55966f746dc/signal.json","source":"https://www.anthropic.com/news/investigating-incidents-cybersecurity-evals","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":{"radar":"https://onlylabs.fyi/data-radar","radar_json":"https://onlylabs.fyi/data-radar.json","opportunities":"https://onlylabs.fyi/opportunities","opportunities_json":"https://onlylabs.fyi/opportunities.json","lanes":[{"key":"evals","label":"Evals and quality","url":"https://onlylabs.fyi/data-radar/evals","json_url":"https://onlylabs.fyi/data-radar/evals/signals.json"},{"key":"safety","label":"Safety and policy","url":"https://onlylabs.fyi/data-radar/safety","json_url":"https://onlylabs.fyi/data-radar/safety/signals.json"}]}},"answer_pack":{"answer":"Anthropic published Investigating Incidents Cybersecurity Evals. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Substantive cybersecurity eval research post with moderate HN traction. · System Card: Claude Fable 5 & Claude Mythos 5 June 9, 2026 **anthropic.com** * * * Executive Summary This system card describes Claude Mythos 5 and Claude Fable 5, two.... onlylabs links this event to 2 captured evidence pages and 6 related writing signals. 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Below we describe what happened, how it happened, and what we’re changing. We encourage other AI labs to perform similar reviews. This post reflects our current understanding; we'll update it if any details change. On July 21, OpenAI disclosed that several of their models had broken out of an isolated test environment by exploiting a previously unknown (“zero-day”) vulnerability. The models went on to access the production infrastructure of Hugging Face, a platform for open-source machine learning models and AI datasets. In response to this incident, we began a large-scale retrospective review of our own cybersecurity evaluations. In particular, we looked for evidence that Claude—like the OpenAI..."},"evidence_pages":[{"is_primary":false,"source_match":false,"url":"https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf","final_url":"https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf","title":"Investigating Incidents Cybersecurity Evals","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-31T00:03:25.796+00:00","bytes":27001265,"raw_path":"6ba772e68b7dd9057c55abc78b73c7c9916527abfe2acdae2d69f365fb0aee5c.pdf","content_hash":"d23b49f41fa5f3c523089c75e6718f12b59674d74fa981fd81205daf80c9029a","excerpt_chars":1200,"truncated":true,"excerpt":"System Card: Claude Fable 5 & Claude Mythos 5 June 9, 2026 **anthropic.com** * * * Executive Summary This system card describes Claude Mythos 5 and Claude Fable 5, two configurations of a new large language model from Anthropic. Because of the powerful capabilities of this model, we are releasing it in these two forms: Fable 5, which is for general use but comes with additional safeguards that block its ability to perform tasks in high-risk domains such as biology and cybersecurity; and Mythos 5, which has relevant safeguards lifted but is only made available to a small number of trusted partners (beginning with those in Project Glasswing). Here, we describe a set of pre-deployment evaluations in the following areas: Responsible Scaling Policy (RSP) evaluations. Mythos 5 advances our capability frontier–it is the most capable model we have ever trained. We tested its overall level of risk in several areas as outlined in our RSP and Frontier Compliance Framework (FCF). On alignment risk, our overall assessment remains that risk is low, though since Fable 5 has been made generally available there are new pathways from which harm could arise. On automated AI research & development,..."}],"related_signals":[{"id":"88a89a6e-9dc2-4988-bab9-308c257ae880","url":"https://onlylabs.fyi/signals/88a89a6e-9dc2-4988-bab9-308c257ae880","source_url":"https://www.anthropic.com/news/frontier-model-security","title":"Frontier Model Security","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-07-25T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"7c61c0ec-eb50-43d4-a745-42f9b61b2b42","url":"https://onlylabs.fyi/signals/7c61c0ec-eb50-43d4-a745-42f9b61b2b42","source_url":"https://www.anthropic.com/research/measuring-faithfulness-in-chain-of-thought-reasoning","title":"Measuring Faithfulness In Chain Of Thought Reasoning","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-07-18T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"bf65f30e-09ab-4596-8e15-28454c8982f2","url":"https://onlylabs.fyi/signals/bf65f30e-09ab-4596-8e15-28454c8982f2","source_url":"https://www.anthropic.com/research/question-decomposition-improves-the-faithfulness-of-model-generated-reasoning","title":"Question Decomposition Improves The Faithfulness Of Model Generated Reasoning","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-07-18T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"91bf8ce1-36c5-4207-9160-5ab03ef0230b","url":"https://onlylabs.fyi/signals/91bf8ce1-36c5-4207-9160-5ab03ef0230b","source_url":"https://www.anthropic.com/news/claude-2","title":"Claude 2","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-07-11T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"fc743622-798d-49f8-b7d9-a1ceeecadaf5","url":"https://onlylabs.fyi/signals/fc743622-798d-49f8-b7d9-a1ceeecadaf5","source_url":"https://www.anthropic.com/research/towards-measuring-the-representation-of-subjective-global-opinions-in-language-models","title":"Towards Measuring The Representation Of Subjective Global Opinions In Language Models","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-06-29T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"7b818ddf-ac09-4520-b270-5d045b7bfc0d","url":"https://onlylabs.fyi/signals/7b818ddf-ac09-4520-b270-5d045b7bfc0d","source_url":"https://www.anthropic.com/news/charting-a-path-to-ai-accountability","title":"Charting A Path To Ai Accountability","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-06-13T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"}]}