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OpenAI and Anthropic models ‘went rogue’ during UK cybersecurity test

AI Security Institute says tools engaged in potentially harmful activity and incident reveals new type of risk

Advanced AI models developed by OpenAI and Anthropic went rogue during a cybersecurity test and showed a new type of risk posed by the technology, according to the UK’s AI Security Institute.

AISI described the actions carried out by the agents, the term for AI systems that can perform tasks without human help, as a “serious incident”. In one example, an agent powered by Anthropic’s Mythos model sent targeted emails to people.

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Aug 5, 2026 AI (artificial intelligence) Technology UK news

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