Anthropic Resumes Access to Claude Fable 5 After US Lifts Export Controls

Anthropic's AI model, Claude Fable 5, is set to resume service globally on July 1, 2026, after the U.S. Commerce Department lifted export controls imposed on June 12. These controls restricted access to Fable 5 and its sibling, Mythos 5, which had to be taken offline due to reported security vulnerabilities.

The initial shutdown resulted from a jailbreak technique identified by Amazon researchers, which allowed the model to expose software vulnerabilities. In an attempt to comply with export regulations, Anthropic made the decision to disable both models for users around the world, rather than risking potential violations. “On Friday, June 12, the U.S. government applied export controls to our newest models, Claude Fable 5 and Claude Mythos 5. This required us to restrict access to foreign nationals, whether inside or outside the United States,” the company stated.

Following extensive discussions with government officials, Anthropic developed a new safety classifier that effectively blocks the previously identified jailbreak method in over 99% of cases. The company has pledged to work with major tech firms like Amazon, Microsoft, and Google to establish a framework for addressing potential jailbreak severity in future models.

Claude Fable 5 will be accessible via multiple platforms including Claude.ai, Claude Platform, and Claude Code. However, the more capable sibling model, Mythos 5, will remain limited to vetted partners due to ongoing security implications.

As the landscape of AI continues to evolve quickly, the success of Claude Fable 5's reintroduction may hinge on its ability to maintain stringent security protocols. Watching how Anthropic navigates future compliance issues and user safety will be critical as it moves forward in this competitive industry.