Anthropic · Claude · Mythos · GPT · U.S. · Decrypt
Sacks further claimed that Anthropic’s reaction to the government’s request ran counter to the company’s own public claims
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“Anthropic prioritized the continued offering of the consumer model over safety,” Sacks wrote.
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 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. The directive bars any foreign national from accessing the models, whether inside or outside the United States.