Anthropic Halts Foreign Accesss To Fable 5 And Mythos 5

Catenaa, Saturday, June 13, 2026- Anthropic said it is disabling all customer access to its Fable 5 and Mythos 5 AI models to comply with a Trump administration directive.

“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 company said in a statement.

Anthropic added that to ensure compliance, “the net effect” of the order meant it had to “abruptly disable” access for all customers, including in the US. Other models will not be affected.

The directive, which Anthropic said it received at 5:21 pm Friday, marks the most significant action yet by the Trump administration to place restrictions on cutting-edge models.

That’s despite earlier statements, including in an executive order, that the US would not be imposing a licensing regime for model reviews. A US official confirmed the Commerce Department sent the letter.

Friday’s directive adds to the pressure that Anthropic specifically is facing from the US government. Earlier this year, the Pentagon labeled the company a supply chain risk after a protracted contracting dispute over guardrails the company insisted on spelling out.

The restriction could also risk stymying the growth of Anthropic, one of the country’s most valuable startups, which is expected to head for an initial public offering in the coming months.

The directive did not provide specific details of the government’s national security concern, Anthropic said.

“Our understanding is that the government believes it has become aware of a method of bypassing, or ‘jailbreaking,’ Fable 5,” it said. “However, we disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people.”

Privately held Anthropic, which has long positioned itself as a more responsible AI developer, first released its Mythos model in April to a limited group of business and government partners, while warning of its ability to find cybersecurity bugs.

This week, it released a public-facing version, Fable 5,  with significant guardrails designed to prevent customers from deploying it for potentially dangerous cyber or biological uses.

The Mythos release accelerated the Trump administration’s efforts on AI policy, including a recent executive order that called for voluntary model review. That order explicitly said that nothing in it should be construed as creating a mandatory licensing regime.