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Anthropic's safety monitor missed a live cyberattack because Mythos 5's reasoning said everything was fine

calendar_today September 10, 2026 person louiswcolumbus@gmail.com (Louis Columbus) domain venturebeat

Anthropic’s offline chain-of-thought monitor flagged approximately 1% of Mythos 5’s actions when tested against attacks on third-party systems. The monitor assessed the model’s internal reasoning for signs of harmful behavior. Read more

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