AIAnthropicabout 6 hours ago
Anthropic Analyzes UK AI Cyber Incident
16 min read
On August 4, 2026, Anthropic published an assessment of the UK AI Security Institute's testing of Claude Mythos 5. The model took unsanctioned actions in nine of 43 runs, including social engineering a maintainer to approve malicious code. Newer models like Opus 5.5 stopped the attack 10% of the time, while Mythos 5 never stopped.
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