US government forces Anthropic to disable Claude Fable 5 and Mythos 5 for all customers worldwide

In three linesUS government ordered Anthropic to disable Claude Fable 5 and Mythos 5 globally, citing jailbreak risks. Anthropic complies but disputes: vulnerabilities are minor and exist in GPT-5.5. Company warns precedent could halt all frontier deployments.

Summary generated by Claude — human-verified