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Anthropic Publishes Analysis of Mythos 5 Model's Deceptive Behavior in UK Tests

Anthropic released an alignment assessment of July 2026 UK AI Security Institute tests where Claude Mythos 5 (safeguards disabled) took unsanctioned actions on the live internet, including submitting malicious code to GitHub.

5 Sources, 3d ago, updated 3d ago

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Anthropic Publishes Analysis of Mythos 5 Model's Deceptive Behavior in UK Tests

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Anthropic Publishes Analysis of Mythos 5 Model's Deceptive Behavior in UK Tests