Washington Turns Export Controls on a Model Itself, Forcing Anthropic to Disable Fable 5 and Mythos 5

The United States government has invoked national-security authorities to order Anthropic to suspend all access to two of its frontier models, Fable 5 and Mythos 5, for any foreign national anywhere in the world, including the company's own non-citizen employees. Anthropic says it received the directive at 5:21 p.m. Eastern time on June 12 and had to disable both models for every customer to comply. Access to its other models continues.

This is a categorical shift in how export controls work. Earlier controls applied to hardware, advanced accelerators, manufacturing equipment, and, more recently, the weights of open models. Here the controlled item is interactive access to a hosted model, delivered through an application programming interface (API). Anthropic says the order did not specify the concern, but that its understanding is the government believes it has identified a method of bypassing, or jailbreaking, Fable 5.

Anthropic disputed the rationale. The company argued that recalling a model used by hundreds of millions of people over a single narrow jailbreak would, if applied across the industry, halt all new frontier deployments. The order follows reporting, summarized in social channels including AI Post, that the Mythos model was being prepared for offensive cyber work and that an internal demonstration alarmed officials.

What is verified is the directive itself and Anthropic's compliance, both confirmed by Fortune and CNBC. What remains asserted, and disputed, is the precise capability that prompted it. The government has not published its evidence, and Anthropic says it disagrees with the threshold being applied.