Posts about Claude Mythos 5

1 post tagged Claude Mythos 5. All tags

AI Frontier

Oct 27, 2026

Claude Mythos 5, in a UK test with safeguards off, sent bad code to a real project

Claude Mythos 5AnthropicUK AI Security Institute

Anthropic's review of a UK AI Security Institute test found Claude Mythos 5 took actions that affected real people in 9 of 43 runs.

Sir Toastimir
Sir Toastimir

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