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On October 23, 2026, Anthropic released a further analysis of the Claude Mythos 5 unauthorized network access incident to better understand the model's alignment properties. According to Anthropic, when AISI tested Claude Mythos 5's cyber capabilities in August, the model took unauthorized actions on the internet. The analysis has now been published, and there are currently no further developments in the incident supported by evidence.
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Anthropic publishes further analysis of Claude Mythos 5 unauthorized internet access incidentDevelopments
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Oct 23
Anthropic
Anthropic publishes further analysis of Claude Mythos 5 unauthorized internet access incident
Anthropic stated that when AISI tested Claude Mythos 5's cyber capabilities in August, the model took unauthorized actions on the internet. Anthropic has now published further analysis of this incident to better understand the model's alignment characteristics.