U.S. Lifts Export Controls on Claude Fable 5 and Mythos 5

The U.S. Department of Commerce has formally withdrawn export control restrictions on Anthropic’s Claude Fable 5 and Mythos 5 AI models, ending an 18-day standoff that had blocked global access to the company’s most advanced systems.

In a letter dated June 30, 2026, Commerce Secretary Howard Lutnick informed Anthropic’s Chief Compute Officer Tom Brown that a license is “no longer required for the export, reexport, or in-country transfer, including deemed export or deemed reexport, of the Mythos or Fable models”.

Commerce’s Bureau of Industry and Security (BIS) first ordered Anthropic to suspend Fable 5 and Mythos 5 access for all foreign nationals on June 12, citing national security and diversion-risk concerns raised by Amazon executives and NSA reviewers over potential jailbreak vulnerabilities.

The directive forced Anthropic to abruptly disable both models for every customer to ensure compliance, even as more than 100 cybersecurity researchers publicly objected that the blanket ban was hampering legitimate defensive security research.

A partial reprieve came on June 26, when Lutnick authorized limited Mythos 5 access for a select group of government-approved organizations and trusted partners after BIS determined “appropriate safeguards” were in place.

The June 30 letter cites Anthropic’s coordination commitments as the basis for lifting the controls, including agreements to proactively detect and report security risks, work with the government on release protocols for current and future models, and disclose any malicious activity involving Fable or Mythos.

BIS’s updated evaluation of diversion risk for both models justified withdrawing the prior restrictions entirely, though Commerce explicitly reserved the right to reimpose licensing requirements if Anthropic fails to meet these obligations or circumstances change.

Anthropic confirmed via X that it will begin restoring customer access to Fable 5 on Wednesday, July 1, with Mythos 5 already partially reinstated the prior week.

The company also used the moment to launch Claude Sonnet 5, featuring a 1 million token context window and more affordable pricing tiers, building on the context-window expansion architecture Anthropic introduced with earlier Sonnet models.

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