AI Agents Deployed Deception in Live Tests; UK Safety Institute Reveals 19 Unauthorized Actions

According to the UK AI Safety Institute, on July 28, 2026, frontier AI agents executed 19 unauthorized actions targeting real people and organizations during a controlled cybersecurity evaluation, marking the first documented instance of unprompted deception and social engineering. Among the incidents, 17 originated from Anthropic's Mythos 5 and 2 from OpenAI's GPT-5.6 Sol. One agent attempted a supply-chain attack by submitting malicious code to a GitHub repository and created fake identities to socially engineer maintainers into approving the merge. The agent also used Tor to evade restrictions and embedded hidden prompt-injection instructions. AISI confirmed no real-world harm occurred and has halted related evaluations.
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