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Howard Lutnick

Illustration of butterflies breaking through bent prison bars, symbolizing the lifted restrictions on Fable 5 and Mythos 5.

U.S. Government Lifts Restrictions On Anthropic’s Fable 5 And Mythos 5

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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.

Vintage butterfly S illustration on a laptop screen amid a blue digital network, representing Anthropic Mythos 5 limited release.

U.S. Allows Limited Release Of Anthropic’s Mythos 5

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Commerce Secretary Howard Lutnick authorized limited access to Anthropic’s cybersecurity-focused Mythos 5 model for approved organizations while broader restrictions remain in place.

The U.S. Commerce Department approved the limited release of Anthropic’s Mythos 5 AI model to select organizations, while continuing to restrict access to its consumer-focused Fable 5 model.

According to a letter from Commerce Secretary Howard Lutnick reviewed by Reuters, the authorization allows Anthropic to give access to Mythos 5 to a defined group of trusted U.S. organizations following the government’s earlier suspension of both models. Axios, which also reviewed the letter, reported the decision followed what the department described as “significant progress” by Anthropic in implementing appropriate safeguards.

According to Reuters and Axios, the letter includes five key provisions:

  • Limited access to Mythos 5 is restored. Anthropic may now provide the model to approved trusted organizations under the revised authorization.
  • Access is limited to approved organizations. Reuters reported that more than 100 organizations, including many Fortune 500 companies and critical infrastructure partners, are eligible under the authorization.
  • Foreign-national employees may use the model. Employees of approved organizations may access Mythos 5 without requiring additional export licensing, according to Reuters.
  • Commerce retains the authority to modify the decision. Reuters and Axios reported that the department reserved the right to revise or withdraw the authorization if circumstances change.

Earlier this month, the Commerce Department directed Anthropic to suspend access to Mythos 5 and Fable 5 after national security concerns emerged following a reported jailbreak involving the models.

The White House decision follows another recent example of government involvement in frontier AI deployments. On the same day, OpenAI announced it would limit the release of its new GPT-5.6 Sol model at the request of the U.S. government.

Anthropic said it is working to restore access to Mythos 5 for approved organizations while continuing discussions with the U.S. government regarding the broader availability of its frontier AI models.