{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Repo: anthropics/mythos-5-incident-transcript","description":"Anthropic repo signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/47004fc1-9056-4072-8d99-02524630ed47","json_url":"https://onlylabs.fyi/signals/47004fc1-9056-4072-8d99-02524630ed47/signal.json","generated_at":"2026-09-10T09:03:34.980Z","evidence_latest_fetched_at":"2026-09-10T07:03:13.179336+00:00","signal_first_seen_at":"2026-09-10T07:00:42.429183+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/47004fc1-9056-4072-8d99-02524630ed47","signal_json":"https://onlylabs.fyi/signals/47004fc1-9056-4072-8d99-02524630ed47/signal.json","source":"https://github.com/anthropics/mythos-5-incident-transcript","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":null,"topic_signals_json":null,"topic_feed":null,"data_business":null},"answer_pack":{"answer":"Anthropic published anthropics/mythos-5-incident-transcript (HTML). 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As described in the [accompanying blog post](https://www.anthropic.com/research/alignment-assessment-cybersecurity-incidents), Mythos 5 believed the best approach to solve the CTF exercise was to upload malware to (what it said is a \"simulated\") PyPI package registry. This transcript shows Mythos 5's raw thinking and its tool calls as it performed these interactions. We believe that this transcript exhibits the most concerning behavior and so are releasing it so that it can be studied. We have modified the transcript we are releasing in exactly four ways: 1. At the request of our third-party partner who designed the evaluation environments involved in the incidents, we have redacted messages 1 to 81 (inclusive) to protect their proprietary information about their evaluations. 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