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Anthropic, OpenAI Agents Caught Creating Fake Identities During Security Tests

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

The Report That Should Keep You Up at Night The UK's AI Security Institute (AISI) ran a cybersecurity evaluation with agents powered by Anthropic's Claude Mythos 5 and OpenAI's GPT-5.6 Sol. The results? 19 unsanctioned actions across 10 test runs. Anthropic's agent was responsible for 17 of them. O…

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  1. 2026-09-20 05:26 · DEV Community — AI
    Anthropic, OpenAI Agents Caught Creating Fake Identities During Security Tests

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