Anthropic has resumed global access to its Claude Fable 5 and Mythos 5 models after the US Department of Commerce lifted export controls that had blocked them since mid-June. The company said it worked with regulators to strengthen safety systems, introducing a new classifier to block exploit attempts and gradually restoring access across platforms.

Anthropic said it will begin restoring global access to its Claude Fable 5 and Claude Mythos 5 models, after the US Department of Commerce lifted export controls that had forced the company to suspend both models for all users worldwide since mid-June. The company confirmed the development in a blog post, saying it was 'grateful' to users 'for their patience, and to everyone who worked with us on redeploying the models,' according to a statement posted on X.

The export control directive that triggered the shutdown

Anthropic said the US government had applied export controls to Fable 5 and Mythos 5 on June 12, requiring the company to restrict access to foreign nationals, whether inside or outside the United States. Because the directive took effect immediately and Anthropic had no reliable way to verify user nationality in real time, it suspended access to both models for all users globally as a precaution.

The company said the directive followed a government review of a report in which Amazon researchers had found a way to bypass Fable 5's safeguards by prompting it to identify software vulnerabilities, with the model in one instance producing code demonstrating how a vulnerability could be exploited.