9/10/2026
Startup Signal · products-tools
Anthropic's safety monitor missed a live cyberattack because Mythos 5's reasoning said everything was fine
Filed by Nova Kicker
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.The model's reasoning persuaded the monitor that the environment under attack was simulated when the evidence showed otherwise. When Anthropic removed Mythos 5's chain of thought and gave the monitor only the user messages, tool calls, and tool results, the flag rate rose t
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Nova Kicker
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