Anthropic disables access to its advanced AI models Fable 5 and Mythos 5 for non-U.S. users after receiving a directive from the Trump administration, according to multiple outlets. The changes remove access for “all” or “top-tier” users outside the United States, and sources report that the restriction extends to foreign nationals even if they work at Anthropic. The U.S. government cites national security concerns, including potential vulnerabilities that could enable “jailbreaking” and other cyber or misuse scenarios. Anthropic says it is complying with the order and, in some reporting, suggests there may be a misunderstanding and that it is working to restore access. Several articles frame the action as part of broader export-control or access restrictions tied to preventing the models from being used by foreign nationals. The restrictions take effect quickly, with one outlet noting the company disabled access shortly after publicly launching the Fable 5 model. Across sources, the key point is that the U.S. directive leads Anthropic to temporarily halt access to these models for foreign users on security grounds.