The US government has issued an export control order restricting access to Anthropic’s most advanced artificial intelligence models, Fable 5 and Mythos 5. The order mandates that Anthropic immediately block access to these models for all foreign nationals, regardless of their location. This restriction applies even to foreign employees of Anthropic itself. Less advanced models offered by the company, including Claude Opus, Sonnet, and Haiku, are not affected by the directive. The move signals increased US scrutiny of AI technology and potential national security concerns related to its international availability. Officials have not publicly detailed the specific reasons behind the restrictions. The order aims to control the dissemination of potentially sensitive AI capabilities to foreign entities. This action highlights the growing debate surrounding the regulation of advanced AI technologies.