Anthropic · Claude · Mythos · GPT · U.S. · Decrypt
US Government Orders Anthropic to Pull Claude Fable, Mythos AI Models
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The U.S. government issued an emergency export control directive on Friday ordering Anthropic to immediately suspend access to its two most powerful artificial intelligence models—Claude Fable 5 and Claude Mythos 5, both released days earlier —for all foreign nationals, including the company's own employees, citing national security concerns.
Key facts
- Sacks added that the administration hopes that Anthropic will fix the issue and that Fable 5 can return to public release
- The directive bars any foreign national from accessing the models, whether inside or outside the United States
- The letter did not provide specific details of its national security concern, but the government believes it has become aware of a method of bypassing, or "jailbreaking," the publicly available Fable
- On Saturday, David Sacks—the co-chair of the President’s Council of Advisers on Science and Technology— wrote on X that “a highly credible, trusted partner of both Anthropic and the U.S. government
Summary
The U.S. government ordered Anthropic to suspend access to its two most advanced AI models, Fable 5 and Mythos 5, citing a national security concern over a potential jailbreak vulnerability. Anthropic complied but disputed the finding, arguing the vulnerability is simple and already replicable using other publicly available models like GPT-5.5. The company warned the directive sets a dangerous precedent that, if applied industry-wide, could halt all new frontier AI model deployments. The directive bars any foreign national from accessing the models, whether inside or outside the United States.