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An alignment assessment of the UK AISI cybertesting incident

  • Anthropic--Anthropic.com
  • published date: 2026-10-23 14:44:50 UTC

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 the model’s alignment.

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