Summary

• Commerce directed Anthropic to suspend Fable 5 and Mythos 5 access for foreign nationals under national-security export-control authority.
• Anthropic reportedly disabled both models for all customers because its distributed cloud and API infrastructure could not reliably enforce nationality-based access restrictions.
• The dispute centers partly on a reported method for eliciting vulnerability-fixing and testing capabilities from Fable 5 despite cybersecurity safeguards.
• A separate Project Glasswing access issue involving South Korean telecommunications company SK Telecom reportedly contributed to the government’s loss of confidence in Anthropic’s vetting.
• Anthropic and cybersecurity professionals disputed whether the reported technique created meaningful new offensive capability and warned that restrictions could deprive defenders of useful tools.
• The episode exposes unresolved questions about applying deemed-export rules to internet-delivered models, APIs, cloud platforms, and foreign-national users inside the United States.
• Anthropic indicated that the models might return, but no confirmed restoration date or final resolution is established in the supplied material.