Anthropic disables Fable and Mythos AI models after U.S. government bars it from giving foreigners access

Anthropic's newest AI models Fable 5 and Mythos 5 were disabled late Friday after the U.S. Commerce Department barred distribution to any foreign national, including non-citizen employees in the United States. Claude models remain available, but the directive constraint forced temporary shutdowns across the advanced models. Anthropic said it received the directive at 5:21 pm ET and argued the cited jailbreak was a narrow flaw not a universal vulnerability. Officials claimed the jailbreak could unlock cybersecurity capabilities within Mythos. Anthropic criticized the move as disproportionate to the risk and warned it could stall frontier model deployments. Policy experts reacted with disbelief, framing the step as involuntary punishment amid ongoing debates over export controls. The company emphasized support for a transparent and fair regulatory process.