U.S. Government Suspends Anthropic's Latest Models Claude Fable 5 and Mythos 5 Over Jailbreak Concerns on June 12

According to Anthropic, on June 12 the U.S. government issued an urgent export control directive, requiring the AI company to immediately suspend global access to its latest models Claude Fable 5 and Mythos 5 for all foreign nationals, including non-U.S. employees. The shutdown came after reports of a potential jailbreak method affecting the Mythos model.

Anthropric disputed the decision, stating it was based on a "serious misunderstanding." The company argued that the reported jailbreak was "narrow and non-universal"—merely a request for the model to read and fix code in a specific repository—not a comprehensive safety bypass. Anthropric warned that applying such strict standards industry-wide would halt all frontier AI model deployments. The company said it is working with U.S. officials to clarify the misunderstanding and restore access.