AI analyst Nate B Jones reports that the US government ordered Anthropic to pull Claude Fable 5 and Mythos 5 from public access, citing reported jailbreak vulnerabilities and applying foreign-national restrictions so broadly that full removal became the compliance path. This is the first documented rollback of a frontier model due to regulatory action. The broader implication: frontier model access is now a policy surface where regulation weighs equally with technical capability. Developers should avoid building critical systems around model availability.

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