Fable 5 is now generally available, while Mythos 5 continues its approved rollout through Anthropic’s Glasswing program after the government ended restrictions on both frontier AI models.
Anthropic resumed access to its Fable 5 and Mythos 5 frontier AI models after the U.S. government lifted restrictions that temporarily halted their release due to national security concerns.
The announcement marks the end of an unusual government intervention that interrupted the launch of Anthropic’s most advanced AI models. Under the updated arrangement, Fable 5 is now generally available, while Mythos 5 continues its approved deployment through Anthropic’s Glasswing program for select enterprise partners, consistent with the authorization the company received on June 26.
The restrictions began on June 12, just three days after Anthropic introduced Fable 5 and Claude Mythos 5, when the U.S. government directed the company to suspend public access while additional national security evaluations were conducted. The restrictions marked an unprecedented government intervention in the release of frontier AI models.
On June 26, the government approved the limited return of Mythos 5 through Anthropic’s Glasswing program, allowing a select group of enterprise organizations to begin using the model. The latest announcement completes the process by restoring access to Fable 5 and formally ending the temporary restrictions on both models.
In an X post announcing the decision, U.S. Commerce Secretary Howard Lutnick confirmed that the government lifted the remaining restrictions following its review. Anthropic separately announced that Fable 5 is now publicly available and reaffirmed that Mythos 5 will continue to be offered through Glasswing, the company’s controlled deployment program for advanced frontier models.
Anthropic said the company appreciated its collaboration with the U.S. government throughout the review process and reiterated its commitment to the responsible deployment of increasingly capable AI systems.
