Claude Fable 5 Ban: Anthropic’s Standstill with US Government

A recent report describes the U.S. government's emergency export control that forced Anthropic to stop offering Claude Fable 5 to non-U.S. citizens after a security engineer reported critical jailbreak vulnerabilities capable of bypassing safety restrictions. Anthropic withdrew the model globally, sent senior technical staff to negotiate with U.S. officials, and disputes remain as the government refuses to lift the ban until the vulnerabilities are fully mitigated.