The US government has issued an export control directive suspending foreign access to Anthropic's highly anticipated advanced AI models, Claude Mythos 5 and the more restricted version, Claude Fable 5. The order, delivered late on Friday, bars any foreign national, whether inside or outside the US, including Anthropic's own foreign national employees, from using the company's industry-leading cybersecurity-focused models.
Senior Anthropic technical staff are now reportedly in Washington, meeting with White House officials in a bid to resolve what has quickly become the AI company's second significant dispute with the Trump administration in just over three months. Anthropic says it has disabled the models for all customers worldwide while it works out how to enforce the restrictions.
The episode carries high stakes not only for global AI users but for Anthropic itself, which is targeting a public listing valued at more than $1 trillion. That figure now hangs in the balance as the company navigates a second collision with the very government whose confidence it may need to go public.
A Jailbreak Claim, a 90-Minute Window, and a Standoff
The trigger for Friday's order was reportedly a vulnerability in Fable 5's safety guardrails. Amazon CEO Andy Jassy allegedly raised concerns with the White House on Thursday over the model's potential to be "jailbroken." A rapid sequence of calls followed on Friday between senior administration officials and Anthropic CEO Dario Amodei, during which Treasury Secretary Scott Bessent apparently told Amodei directly that he was making a "bad decision" by declining to voluntarily withdraw the model.
When Amodei declined to act, the administration moved swiftly. Anthropic says the letter arrived at 5:21 p.m. EST, citing national security concerns but offering no specific technical details.
Anthropic has contested the severity of the vulnerability, arguing that no testers have yet discovered a universal jailbreak and that the level of capability cited in the government's report "is widely available from other models." It also defended its systems, which it said "are so strong that many users have complained that they are overly broad."
For many teams that had already integrated the models into their daily workflows, the move has been immediate. Robert Davitt, Product Lead at Fin, described the disruption bluntly:
"Feeling quasi-lobotomized working this morning without Mythos. It was a genuine redefinition of the frontier: elite intelligence, high agency, and the strongest reasoning I've witnessed. I'm looking at our team's backlog and know Mythos would have blitzed a couple of high-priority tasks before lunch."
A Pattern of Friction and a Telling Timeline
The export controls arrive just days after Fable 5's general public release, which itself followed months of closely managed closed testing by a select group of companies and governments, including the US government itself. That timing has not gone unnoticed. The fact that Washington moved so swiftly after the model's public launch, rather than during the extended test period when it had direct access, raises pointed questions about the motivations behind the order.
It is also not the first time the Trump administration and Anthropic have clashed. In February, Anthropic published a formal statement refusing to remove safeguards around mass domestic surveillance and fully autonomous weapons from its contracts with the Pentagon. The Department of War subsequently designated Anthropic a "supply chain risk," a label the company called legally unsound, given that Claude remains embedded in critical national security operations across the US intelligence community.
