via MarkTechPost
Anthropic Disables Claude Fable 5 and Mythos 5 After US Government Order
Anthropic has disabled its two most advanced AI models for all customers following a direct order from the U.S. government. The directive, issued on June 12, 2026, invoked national security authorities and specifically named Claude Fable 5 and Claude Mythos 5. Both models had been launched just three days earlier, on June 9.
The order prohibits access by any foreign national, whether located inside or outside the United States, and extends to Anthropic’s own employees who are foreign nationals. Because Anthropic lacks the ability to filter foreign nationals from U.S. users in real time, the company opted to shut down both models for all users to ensure compliance.
Access to all other Anthropic models remains unaffected. Claude Opus 4.8 and the company’s other offerings continue to operate normally.
This incident highlights the growing tension between the rapid release of cutting-edge AI capabilities and government concerns over national security and technology export controls. As of mid-2026, the U.S. government has increasingly tightened restrictions on advanced AI models, particularly those with potential dual-use applications.
For developers and businesses relying on Anthropic’s frontier models, this sudden suspension underscores the risks of depending on models that may be subject to abrupt regulatory action. Anthropic has not announced when or if the models will be reinstated, and no timeline for review has been provided.