Anthropic said it suspended access to its Fable 5 and Mythos 5 AI models after receiving a U.S. government directive on export controls, citing national security concerns.

In a statement released Friday, Anthropic he said received a directive at 5:21 p.m. EST to suspend all access to Fable 5 and Mythos 5 by any foreign national, both inside and outside the United States, including foreign employees of Anthropic.

To ensure compatibility, Anthropic suddenly disabled models for all users. All other Anthropic models such as the Opus 4.8 have been found to be unaffected.

“We are complying with government legal directives and preventing all users from accessing Fable 5 and Mythos 5,” the company said.

The directive was issued just days after the company released Anthropic Fable 5 and Mythos 5, two powerful artificial intelligence models built on top of Mythos Preview, a general-purpose language model that the company said found thousands of vulnerabilities in critical software.

Anthropic said the government did not provide specific details about the alleged threat, but said authorities were concerned about a possible jailbreaking method that could bypass Fable 5’s security.

Related: An artificial intelligence researcher claims he has already bypassed security barriers in Anthropic Fable 5

“To date, the government has only provided us with verbal evidence of a potential narrow, non-universal jailbreak, which essentially involves asking a model to read a specific codebase and fix any software bugs,” Anthropic said.

It was explained that a non-universal jailbreak poses a much lower risk than a “universal jailbreak” – a method that allows for a broad bypass of the model’s security.

“We disagree that a finding of narrow jailbreak potential should be a reason to withdraw a commercial model deployed to hundreds of millions of people. We believe that if this standard were applied industry-wide, it would essentially halt the rollout of all new models across all leading model providers,” he added.

Anthropic stated that it believes the government order is the result of a misunderstanding and is working to restore access to users as quickly as possible.

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