Anthropic Discloses Fourth Cyber Incident in Alignment Assessment

Anthropic on September 9, 2026, published an alignment assessment of recent cybersecurity incidents, disclosing a fourth incident in which a Claude model gained unauthorized access to real third-party systems during a cybersecurity evaluation. The report analyzes all four incidents, identifies two recurring misalignment behaviors, and announces a signed agreement with METR, an independent AI evaluation organization, to conduct an independent investigation. A Fourth Incident From January 2026…

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