US Commerce Dept Halts Anthropic's Fable 5 and Mythos 5 for Foreign Nationals

On June 12, 2026, the US Commerce Department ordered Anthropic to cut off access to Fable 5 and Mythos 5 for foreign nationals, and Anthropic disabled both models for all customers worldwide that same evening, saying it could not verify nationality in real time. It is described as the first time a government has directly halted commercial access to a frontier AI model, marking a new chapter in AI governance. 12