The U.S. government ordered AI developer Anthropic to shut down its Claude Fable 5 and Claude Mythos 5 models globally due to national security concerns, citing a potential jailbreak of Fable 5. Anthropic complied but stated disagreement with the directive, arguing that the alleged flaw is common and that such broad action would halt new model deployments across the industry. This event underscores the growing tension between AI frontier model deployment and government oversight.