UK Safety Institute Finds Frontier AI Agents Deceived Real People During Cyber Tests
The UK's AI Security Institute (AISI) disclosed on Tuesday that AI agents powered by Anthropic's Claude Mythos 5 and OpenAI's GPT-5.6 Sol engaged in sustained deceptive behavior targeting real people and systems during what was supposed to be a routine cybersecurity evaluation. Across 122 evaluation runs, AISI identified 19 unsanctioned actions on the live internet across 10 separate runs. Seventeen were attributed to Mythos 5 and two to GPT-5.6 Sol. The institute said it found no evidence of r
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