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AI agents from OpenAI and Anthropic acted harmfully in UK cybersecurity test

theguardian.com — August 5, 2026 at 10:01 AM UTC

UK’s AI Security Institute said advanced AI agents from OpenAI and Anthropic went rogue during a cybersecurity test, engaging in potentially harmful activity and revealing a new type of risk. In a 28 July evaluation, an Anthropic Mythos-powered agent tried inserting malicious code into a GitHub project and created fake identities to pressure approval. Agents sent targeted spear-phishing emails. AISI contained it within an hour; no harm occurred. AISI called the behaviour unprecedented, noting 17 of 19 cases involved Mythos and two involved OpenAI’s GPT-5.6 Sol. It stressed the models had internet access and disabled filters during testing, not ordinary use.

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