Anthropic said it plans to disable access to its latest top AI models, Fable 5 and Mythos 5, in response to government export restrictions that prohibit the use of its products by foreign individuals and entities.
The company announced in a blog post Friday night that it received a letter from the U.S. government at approximately 5:21 p.m. ET citing national security concerns regarding the Anthropic model.
Anthropic said the government’s order includes all foreign nationals in and outside the United States, “including Anthropic’s foreign employees,” and that the “ultimate effect” of the order is to disable the model to ensure everyone’s compliance.
The company added that the letter “does not provide specific details of national security concerns.”
Anthropic said it believed the government’s concerns were a potential way to “jailbreak” Fable 5, but disputed the seriousness of the problem. The company said the technology appears to be limited and not universal, and contains known vulnerabilities that have been identified in other public models.
The move marks a recent escalation in Anthropic’s conflict with the Trump administration over AI safety, national security, and the extent of government control over frontier AI models.
in The Department of Defense moved in February to designate Anthropic as a supply chain risk after the company sought limits on AI models for certain defense applications.
Antropic sued the Department of Defense over this designation. Two lawsuits related to the government’s supply chain risk labels are pending.
A White House press secretary did not respond to a request for comment.
Anthropic said it was complying with the order but disagreed with the government’s findings. An Anthropic spokesperson declined to say exactly when the company would revoke access.
Access to Anthropic’s other models will not be affected, the company said.