Anthropic to restore Claude Fable 5, Mythos 5 after US lifts export controls

Anthropic said that it will begin restoring access to its advanced artificial intelligence (AI) models, Claude Fable 5 and Mythos 5, after the US Department of Commerce lifted export controls.Users may soon be able to use the models that the US government previously restricted on June 12, citing national security concerns. Last week, the Commerce Department partially eased the restrictions by allowing Anthropic to provide Mythos 5 to a limited group of more than 100 “trusted” US organisations, including companies involved in critical infrastructure, while broader public access remained suspended. The curbs are now fully lifted.

We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.

We’ll begin restoring access tomorrow, and will share an update soon.We’re grateful to our users for their patience, and to everyone who worked with us on…

— Anthropic (@AnthropicAI) June 30, 2026

The company said the government did not explain the specific national security concerns behind the order but noted that officials believed they had identified a way to “jailbreak” Fable 5, allowing some of its safeguards to be bypassed.

“We reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities,” Anthropic said in its notice to users.

“These vulnerabilities all appear relatively simple, and we have found that other publicly-available models are able to discover them as well without requiring a bypass.”

Defending its safety measures, Anthropic said it had worked with the US government, the UK’s AI Safety Institute and independent third parties to test Fable 5 before launch.

“No testers have yet been able to find a universal jailbreak — a jailbreak method that can very broadly bypass the model’s safeguards,” the company said.

The move will ease some of the simmering tension between Anthropic and the Trump administration. The company has already sued the US Department of Defense after Secretary Pete Hegseth designated Anthropic as a supply-chain risk following an unsuccessful contract renegotiation process.

Though now reversed, the department’s export control directive marked the most significant intervention by the US government to date into an AI venture’s operations and sparked legal questions over whether export controls can be used to regulate AI model access.

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