Anthropic Restores Claude Fable 5 Access After US Government Decision

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Anthropic has lifted restrictions on Claude Fable 5 and Mythos 5 following a decision by the US government, with access restored to users starting today. Until July 7, the model will be available within weekly usage limits, after which access will transition to the API. The restrictions were originally imposed after researchers discovered a method to bypass Fable's safeguards in cybersecurity-related tasks, as flagged in an Amazon report. Anthropic clarified that the exploit did not grant users Mythos-level capabilities. The company has since deployed a new safety classifier that blocks the bypass method in over 99% of cases and is also working on a common standard for evaluating AI jailbreaks.

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