U.S. Orders Anthropic to Suspend Fable 5 and Mythos 5 Access for Foreign Nationals

Anthropic said on Friday it will "abruptly disable" its most advanced artificial intelligence (AI) models, Claude Fable 5 and Mythos 5, for all users after the U.S. government ordered it to suspend access to the models for foreign nationals, whether inside or outside the U.S., citing national security concerns. The AI company said it received an order at 5:21 p.m. ET, instructing it to suspend

The article reports that the U.S. government issued an export control directive ordering Anthropic to suspend access to its most advanced AI models, Claude Fable 5 and Mythos 5, for all foreign nationals, both inside and outside the U.S., citing national security concerns.[3][5][6] In response, Anthropic is abruptly disabling these models for all customers to ensure compliance, while access to its other models remains unaffected.[3][5] From a CyberSE.AI perspective, this highlights growing regulatory and export control risks around frontier AI models, and the need for organizations building on or integrating such models to have clear governance, access-control policies, and contingency plans for sudden regulatory shutdowns or geography/citizenship-based restrictions.