The US Department of Commerce lifted its export control directive on Anthropic's Claude Fable 5 and Mythos 5 models on July 1, ending an 18-day shutdown that had taken both models offline worldwide. Anthropic said Fable 5 became available globally the same day across the Claude Platform, Claude.ai, Claude Code, and Claude Cowork, while Mythos 5 access was reinstated for a defined set of vetted US organizations.

How the ban unfolded

Commerce imposed the export control directive on June 12 after Amazon researchers reported a method for bypassing Fable 5's cybersecurity safeguards to elicit exploit code for a known vulnerability. Because Anthropic could not verify users' nationality in real time across its cloud distribution partners — AWS Bedrock, Google Cloud, Microsoft Foundry, Snowflake, and its own APIs — the company shut down access globally rather than risk noncompliance.

A partial reversal on June 26 restored Mythos 5 to more than 100 vetted companies and government agencies, but Fable 5, the more widely used consumer and developer model, stayed blocked. Anthropic said at the time it was continuing to negotiate a broader restoration.

Terms of the full restoration

Commerce Secretary Howard Lutnick said Anthropic no longer needs an export license for the models after agreeing to proactively detect and address security risks, cooperate with the government on shared standards for future model releases, and report malicious activity involving its models. Mythos 5's renewed access ties into Project Glasswing, a government cybersecurity initiative for a defined set of US organizations.

Anthropic said Fable 5 usage will count toward up to 50% of weekly limits for Pro, Max, Team, and select Enterprise plans through July 7, after which it transitions to a standard usage-credit model.

Part of a broader framework

The restoration follows OpenAI's negotiated preview of GPT-5.6 Sol to government-approved partners in late June, and both companies have since committed to pre-briefing federal officials ahead of future frontier model releases. Anthropic and other labs are also collaborating on an industry-wide jailbreak severity framework — an attempt to formalize how safety incidents like the one that triggered the Fable 5 ban get classified and disclosed before models reach the public.