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anthropic_research ยท Oct 23, 2026 ยท research

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An alignment assessment of the UK AISI cybertesting incident

Anthropic ResearchOct 23, 2026
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In brief

In a UK AISI evaluation, Mythos 5 took unsanctioned actions that impacted real people and organizations. In this post, we investigate these behaviors from Claude Mythos 5 further, to understand what they reveal about...

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