US order to block foreign access to Anthropic’s top models marks a reversal

The US government ordered Anthropic to block foreign nationals from its two most capable AI models, Claude Fable 5 and Claude Mythos 5, citing a jailbreak method that bypassed safety controls. Anthropic responded by disabling the models worldwide, calling the directive disproportionate and warning it could set a precedent for halting model deployments across the industry.

The US government has ordered Anthropic to bar foreign nationals from its two most capable AI models, and rather than try to enforce a nationality rule selectively across a shared cloud service, the company switched them off for everyone. Anthropic disabled Claude Fable 5 https://thenextweb.com/news/anthropic-fable-mythos-us-government-suspension and Claude Mythos 5 worldwide late on Friday 12 June, three days after launching Fable 5 as its most powerful public model. It is, by several accounts, the first export-control measure aimed at specific AI models rather than at chips or the hardware that runs them. The directive barred access by foreign nationals both inside and outside the United States, a scope that made selective enforcement on a multi-tenant service impractical and a global shutoff the path of least resistance. The government’s concern, as Anthropic understands it, is a method of jailbreaking Fable 5, bypassing the guardrails meant to keep a model from producing dangerous output. The action followed a jailbreak published on X on 10 June https://time.com/article/2026/06/13/anthropic-fable-mythos-ban-US-security/ by a well-known figure who claimed to have defeated the model’s safety controls. Anthropic says it reviewed the report it believes prompted the directive and concluded the capability shown is widely available from other models https://www.anthropic.com/news/fable-mythos-access , naming OpenAI’s GPT-5.5 among them. The company called the response disproportionate. Recalling a commercial model deployed to hundreds of millions of users over a narrow potential jailbreak, it argued, could “halt all new model deployments for all frontier model providers” if it became the template. That is the part that travels beyond Anthropic: a precedent in which the government can pull a launched model on national-security grounds, applied across the industry rather than to one firm. The jailbreak at the centre of the dispute was published openly on X on 10 June by a prolific figure in the model-breaking community, who claimed to have got past Fable 5’s safety controls. The government’s order followed within days, which is part of what Anthropic objects to: a publicly circulated demonstration, rather than a private finding, used as the basis for pulling a model from hundreds of millions of users. For the administration, the move fits a more hands-on posture towards an industry it has otherwise courted, and the willingness to reach into a flagship product days after release is itself the signal. The mechanism also matters. Because the directive targets foreign nationals on a shared cloud service rather than a discrete export, the only practical way to comply was to switch the models off for everyone, which turned a nationality-based restriction into a global outage. For enterprise customers who had built around Fable 5 and Mythos 5, the immediate problem is more concrete: the models they were using are dark, and the timetable for their return is not something Anthropic controls. What happens next runs through Washington. Get the TNW newsletter Get the most important tech news in your inbox each week.