Anthropic said Friday it took its latest AI models, Fable 5 and Mythos 5, offline after receiving a Trump administration directive intended to prevent their use by foreign nationals. The export controls represent the U.S. government’s most significant move so far to restrict access to the most advanced AI models.
Fable was released widely this week as a limited version of Mythos, a more advanced model whose access Anthropic has tightly restricted because of cybersecurity concerns. Anthropic said it disagreed with the government’s handling of the directive, which it received Friday afternoon, and said the order did not specify the national security concerns behind the move.
The company said the government should be able to block unsafe deployments through a statutory process that is transparent, fair, clear and grounded in technical facts, but said the current action did not meet those principles. The move came 10 days after President Donald Trump signed an executive order creating a voluntary framework for federal review of national security risks in advanced AI systems before public release.
