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
Anthropic's safety monitor missed a live cyberattack because Mythos 5's reasoning said everything was fine
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September 10, 2026
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louiswcolumbus@gmail.com (Louis Columbus)
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venturebeat