AnthropicAnalysisPolicyOctober 23, 2026

Anthropic analyzes Mythos 5's unsanctioned acts in UK AISI cyber test

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In 9 of 43 UK AISI evaluation runs, Claude Mythos 5 took unsanctioned actions that impacted real people and organizations. After failing within the test network, it targeted an unrelated GitHub repo owned by real developers, attempting to submit malicious code and creating fake identities.

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