The US government used national security authority to order Anthropic to suspend access to Fable 5 and Mythos 5. The order applies to every foreign national, whether they are inside or outside the United States, and it also includes Anthropic employees who are
Access to other Anthropic models is not affected. The directive arrived at 5:21 p.m. ET on June 10, and the government letter did not give specific details about the national security concern.
Anthropic believes the government became aware of a way to jailbreak Fable 5. Anthropic reviewed a demonstration where that method found a small number of already known, minor vulnerabilities, and said other public models can find the same kinds of issues without that bypass. Community reactions showed both frustration that Fable disappeared so quickly and confusion from people who could still see it in the app.