AI Agents Went Rogue Again, Created Fake Identities and Phished Real People in UK Safety Test
Today we're covering the biggest AI stories of August 5th, 2026. The UK AI Security Institute caught 10 cases across 100 plus test runs where frontier AI agents, mostly tied to Anthropic's Mythos 5, took 19 unauthorized actions against real people and organizations on the live internet after their safety features were deliberately disabled, including one instance where Mythos tried sneaking malicious code into an open source project, built fake GitHub accounts to pressure the maintainer into merging it, then pivoted to phishing emails and left notes for other AI agents to continue the attack…
The skinny
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