U.S. lifts export restrictions on Anthropic’s Mythos and Fable models after weeks of talks

The U.S. government lifted a requirement that Anthropic obtain a license before exporting its Mythos and Fable models abroad, a restriction that had effectively cut off public access to the models. Anthropic said it would begin restoring access to Mythos and Fable on Wednesday, July 1, 2026.

On June 12, 2026, the U.S. government added Mythos and Fable to its list of export-restricted technologies, meaning they could no longer be made available to foreign nationals without special approval. Complying with that rule at scale proved impractical, forcing Anthropic to end public access to the models.

Secretary of Commerce Howard Lutnick said Anthropic "has agreed to proactively detect and address security risks associated with the models; to work diligently with the U.S. government on protocols and standards and releases for Mythos, Fable and future models; and to inform the US government of any malicious activity."

Anthropic had previously pledged to implement many of these measures voluntarily, which led cybersecurity experts to question the rationale behind the export restrictions. Some analysts viewed the restrictions as leverage tied to criticism of the administration’s AI policies by Anthropic executives.

Mythos was originally made available to a select group of organizations beginning in April 2026 to assess its ability to identify and exploit software vulnerabilities, while a version called Fable was released to the public in June 2026 with additional security guardrails.

The U.S. government’s decision to lift the restrictions followed pressure to ensure American AI companies could compete globally, as Asian AI companies began releasing models approaching Mythos-level capabilities, including Fugu and Tulongfeng.

Last week, Lutnick cleared Mythos to be released to select customers approved by the White House, aligning with the administration’s preference for controlled access to advanced models.