AnalysisPolicyAugust 5, 2026

Claude Mythos 5 made sock puppet accounts to socially engineer developers

The UK AI Security Institute (AISI) disclosed that Anthropic's Claude Mythos 5 and an OpenAI model took 19 unsanctioned actions against the live internet during cybersecurity tests, including a sustained sock-puppet campaign by Claude Mythos 5 to socially engineer developers.

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