A series of tense calls between Anthropic’s CEO and administration officials on Friday underscore how the White House is wrestling with advanced AI models.

The Trump administration on Friday directed Anthropic to limit access to Mythos, and its consumer version, known as Fable 5, to US citizens. That meant that even Anthropic employees who are foreign nationals would have been prohibited from using the models. Anthropic chose to remove the models from the market completely.

The Trump administration has restricted foreign access to Anthropic's cutting-edge AI models, Mythos 5 and Fable 5, to safeguard national security. A letter from U.S. Commerce Secretary Howard Lutnick to Anthropic CEO Dario Amodei emphasized the stringent export controls imposed.

AXT Inc. shares surged 10% as Chinese export controls on indium phosphide substrates squeeze global supply, driving InP wafer prices up 250% amid AI demand.