Anthropic Pulls Fable 5 and Mythos 5 Worldwide to Comply With a U.S. Export-Control Directive

Anthropic has abruptly disabled Claude Fable 5 and Claude Mythos 5 for every customer worldwide, complying with a U.S. government directive that orders the company to cut off access to the two models. In a public statement, Anthropic said it received the order on June 12 at 5:21pm ET — just three days after it launched the pair as its most capable models yet — and that it had no choice but to take both offline immediately to comply.

According to the company and to reporting from CNBC and Bloomberg, the directive came from the U.S. Department of Commerce, in a letter from Secretary Howard Lutnick to chief executive Dario Amodei. Invoking export-control and national-security authorities, the order requires a license for the export, re-export, or even domestic transfer of the models, and bars access by any foreign national — whether inside or outside the United States, and explicitly including Anthropic's own foreign-national employees. Because policing that line user-by-user in real time is impractical, the company says the only way to comply was to switch the models off for all of its hundreds of millions of users at once. Existing sessions now error out; new sessions fall back to other Claude models.

The stated trigger is a security concern. Anthropic says the government believes it has identified a way to bypass, or "jailbreak," Fable 5; per Axios, the Commerce Department acted after another company claimed it had jailbroken Mythos. The specific demonstration, Anthropic says, involved asking the model to read a particular codebase and fix its software flaws. The company reviewed the demo and characterized it as "a small number of previously known, minor vulnerabilities," adding that comparable capabilities are already available in rival models such as GPT-5.5.

Anthropic is pushing back. "We disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people," the company wrote, calling the episode a misunderstanding and saying it is working to restore access as soon as possible. No timeline was given. Crucially, the order is narrow in one respect: access to all of Anthropic's other models is unaffected.

The timing is jarring. Fable 5 and Mythos 5 arrived on June 9 to a wave of state-of-the-art benchmark claims, and Fable 5 in particular was marketed on its sanded-down cyber edges — a model deliberately tuned to be harder to misuse. Three days later, a contested jailbreak finding has taken the flagship of that safety-first pitch off the market entirely. Whatever the merits of the underlying vulnerability, the precedent is the story: a single government letter, sent after close of business, can dark a frontier model for the entire planet overnight.