US barring foreign nationals, including Anthropic staffers in the US, from using Fable 5 and Mythos 5 marks a new phase in the US trying to control Anthropic
The company said on Friday night that the federal government had ordered limits on its Mythos and Fable 5 A.I. systems, citing national security concerns.
New York Times
Context & Ripple Effects
The order follows reports that Commerce moved after a claimed jailbreak of Mythos, while Anthropic characterized the restriction as a misunderstanding and said it was working to restore access. Its reported response—disabling both systems for all customers—shows the operational difficulty of separating restricted users from permitted ones.
Subsequent coverage says Anthropic agreed to proactively detect and address security risks and developed a safeguard. European political figures framed the disruption as a warning about reliance on U.S.-controlled AI technology.
First-order effects
Foreign nationals, including Anthropic employees in the U.S., lose access to Fable 5 and Mythos 5 under the order; Anthropic must operate the models under a new nationality-based access constraint.
Anthropic’s broader shutdown of the two systems disrupts customers beyond the people directly covered by the restriction while the company seeks to restore access.
Second-order effects
Anthropic must build and demonstrate controls that identify eligible users and detect security risks, making access governance a product and compliance requirement rather than a back-office policy.
Organizations using these models, particularly outside the U.S., face new continuity risk and may reassess dependence on a single U.S. AI supplier; competitors will be pressed to explain their own access-control and availability policies.
Third-order effects
If restrictions of this kind recur, frontier-model access may become segmented by user nationality and jurisdiction, even when users are physically located in the U.S.
The episode strengthens the case for customers and governments to seek more resilient AI supply arrangements, while putting model-security safeguards at the center of export-control enforcement.
The trend: AI policy is shifting from controls on hardware and exports toward direct regulation of who may use advanced models and under what security conditions.
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of t…
Where is the US with respect to AI policy? It's a mess. Let's start with Trump's Executive Order from June 2, and then turn to last night's Commerce order; neither gets things right. It's fantastic that Trump has issued an executive order that encourages AI companies to do some
JUST IN: Andrej Karpathy, a top AI scientist at Anthropic, is reportedly barred from accessing the company's most advanced AI model because he is not a U.S. citizen. [image]
I can't say I saw this coming. But I do know now that AI companies will be nationalized in America & Trump family will control access to the emerging, weakly godlike entities. This is the darkest path for humanity.
“the order limiting who can use Anthropic's technology is unusually expansive, and could in theory block Anthropic employees who are citizens of allied nations like Canada or Britain from working on it” — www.nytimes.com/2026/06/12/t...