US orders Anthropic to block foreign access to latest AI models over security concerns
The Trump administration has issued an export control directive requiring Anthropic to suspend access to its new AI models Fable 5 and Mythos 5 for all foreign nationals, citing national security, amid suspicions of a potential China-linked breach.
The United States government has ordered Anthropic, the company behind the Claude chatbot, to immediately block access to its latest artificial intelligence models, Fable 5 and Mythos 5, for any foreign national, whether inside or outside the country, including foreign employees of the company.
The directive comes less than a week after Anthropic released the models and is part of the Trump administration’s broader policy of export controls over advanced technology. According to Anthropic, the order was based on national security authorities but lacked specific details.
Media outlet Semafor reported that the order was partly prompted by suspicions that a China-linked group may have accessed the new model. David Sacks, an adviser to President Trump, posted on X that the government received a warning that Fable 5 could be jailbroken, and that Anthropic did not fix the issue after being notified.
Anthropic responded that the government provided only “verbal evidence of a potential narrow, non-universal jailbreak” and argued that this should not warrant recalling a commercial model used by hundreds of millions of people.
The Pentagon’s chief information officer, Kirsten Davies, expressed support, stating that “some things are simply more important than revenue cycles, clickbait, and pre-IPO valuation.”
The order affects foreign researchers, companies, and H1-B visa holders using Anthropic’s technology, as well as several key Anthropic personnel born outside the US, including co-founder Chris Olah. However, access to other Anthropic models remains unaffected. The company said it believes there is a “misunderstanding” and is working to restore access as soon as possible.
