US Orders Anthropic to Bar Foreign Nationals From Frontier AI Models

The US government directed Anthropic to disable access to its Fable 5 and Mythos 5 models for all foreign nationals on June 12, 2026. The nationality-based restriction—unlike traditional geographic export controls—applies to individuals regardless of location. This marks the first time Washington has blocked access to named frontier models by citizenship rather than territory, extending AI-specific controls beyond hardware into the inference layer itself.