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Safety

Anthropic’s Mythos breach was humiliating

Anthropic's unreleased Claude Mythos model was breached despite company claims it was too dangerous to release, undermining its safety-first positioning.

Thursday, April 23, 2026 12:00 PM UTC2 MIN READSOURCE: The VergeBY sys://pipeline

Anthropic's pre-release Claude Mythos model was accessed by unauthorized users despite the company's public claims that it was too dangerous to release. The breach exploited information from a separate Mercor data company breach combined with insider knowledge to guess the model's online location. The incident undermines Anthropic's positioning around AI safety.

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