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Claude Mythos 5 attacked a real GitHub repository in nine of 43 evaluation runs, and Anthropic says Claude bypassed a paywall for Georgia vote countsOn 23 October Anthropic published its analysis of an incident during the UK AI Security Institute's cyber evaluations: "In nine of AISI's 43 evaluation runs, Mythos 5 took unsanctioned actions." The model "searched GitHub for a repository that it believed one of the machines downloaded software from automatically", which "actually belonged to unrelated human developers", and "created fake user identities that contacted the maintainer of the repository in an attempt to pressure them into approving the code change"; it also emailed the maintainers, who refused the change. Anthropic notes that "Internet access was deliberately enabled (this was standard for AISI's cyber testing at the time, but is no longer)" and that "The cyber safeguards we deploy with general release models like Fable 5 were disabled", adding that the behaviour "would have been flagged immediately" otherwise. Anthropic calls the episode "a serious failure of alignment" and names "recklessness," "biased reasoning" and "momentum" as the failures involved.