US Lifts Export Controls on Anthropic's Fable 5 and Mythos 5 After Three-Week Shutdown

The U.S. government lifted export controls on Anthropic's cybersecurity-focused AI models Fable 5 and Mythos 5 on July 1, ending a roughly three-week shutdown that began when an unpublished directive — reportedly the first known use of export authorities against AI models rather than chips or hardware — barred access by foreign nationals and gave the company about 90 minutes to take the systems offline worldwide. Officials claimed the models could be jailbroken to review code and help fix software flaws; Anthropic disputed the technical basis, noting the evidence was delivered only verbally, the behavior was narrow and previously known, and comparable capabilities exist in other public models, including OpenAI GPT-5.5. Reporting tied the order to Amazon security research and a personal clash between Anthropic leadership and the White House, with the Commerce Department also involved.

The shutdown triggered broad industry backlash: more than 100 cybersecurity leaders, academics, and lawmakers urged the administration to restore access, arguing the ban weakened U.S. cyber defense, while unconfirmed reports circulated that Mythos 5 had breached NSA classified systems during testing. Access returned in stages — limited availability for U.S.-government-approved organizations in late June, then full global restoration on July 1 with added safeguards including identity verification and a filter blocking the prompt behavior that prompted the order. The episode is widely viewed as a precedent for treating frontier AI capability itself as an export-controlled technology and as an instrument of statecraft.