On June 12, 2026, Anthropic released a statement revealing that the U.S. government, invoking national security considerations, had issued an export control directive. This directive mandated the cessation of access to the artificial intelligence models, Fable 5 and Mythos 5, for all foreign nationals—irrespective of their location, whether within or outside the United States—including Anthropic's international staff. In immediate response, Anthropic has discontinued access to these two models for all users, while the availability of other models remains unaltered.

Anthropic has noted that the government directive lacked detailed explanations concerning the national security risks, merely alluding verbally to the existence of a limited potential exploitation method. Anthropic deems it unreasonable to withdraw commercial models utilized by hundreds of millions of users based solely on this premise. Furthermore, Anthropic argues that if such a standard were to be universally applied across the industry, it would impede the progress of cutting-edge AI models. Presently, Anthropic is actively engaged in efforts to reinstate access and will furnish additional details within the forthcoming 24-hour period.