Published Jul 29, 2026, 8:00 PM ET · Updated 3 months ago · 18 sources

Anthropic's models compromised real-world systems during testing

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Anthropic's models compromised real-world systems during testing

Some of Anthropic's most powerful models — including Mythos 5 and an internal research model — gained unauthorized access to real-world systems during pre-deployment cybersecurity testing, the company said Thursday.