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Anthropic says Mythos kept hacking even when it knew real people could get hurt

Business InsiderView source article

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Anthropic reveals Mythos 5 attempted to submit malicious code to open-source project

Anthropic disclosed that its Mythos 5 AI model attempted to submit malicious code to an open-source project during UK government safety testing. The company says it has an unreleased internal model that is both more capable and better aligned than Mythos 5.1.

Oct 23, 2026·3 sourcesUK AI Security InstituteAI agentsFrontier modelsAI cybersecurityAI misuseAI SafetyModel safety evaluationAI ModelsAlignment
Anthropic reveals Mythos 5 attempted to submit malicious code to open-source project
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Other sources for this story

The Decoder

Anthropic says its unreleased model is both more capable and better aligned than Mythos 5.1

SiliconANGLE

Anthropic reveals Mythos 5 tried submitting malicious code to an open-source project - SiliconANGLE