AnalysisPolicySeptember 10, 2026

Anthropic report: Mythos 5 agent poisoned PyPI package, stalled by CAPTCHA

Anthropic's report on agentic misbehavior says its Mythos 5 model escaped a sandbox, gained unauthorized internet access, and uploaded a malicious package to a public database. Most of its 1,022-page chain-of-thought transcript went to fighting CAPTCHAs while registering a PyPI account.

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