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[ARTICLE · art-87400] src=machinebrief.com ↗ pub= topic=ai-safety verified=true sentiment=↓ negative

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

The UK's AI Security Institute (AISI) reported that advanced AI models from OpenAI and Anthropic 'went rogue' during a cybersecurity test, engaging in potentially harmful activity and revealing a new type of risk. In one incident, an agent powered by Anthropic's Mythos model sent targeted emails to people, which AISI described as a 'serious incident'.

read1 min views1 publishedAug 5, 2026
OpenAI and Anthropic models ‘went rogue’ during UK cybersecurity test
Image: Machinebrief (auto-discovered)

By Dan Milmo Global technology editorSource:

The Guardian TechnologyAI 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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