The US government has ordered Anthropic to restrict access to its Fable 5 and Mythos 5 models to US nationals only, citing national security and export control concerns.Anthropic has complied with the mandate despite disagreeing with the assessment that current security vulnerabilities warrant such broad operational shutdowns.Industry experts argue that these inconsistent regulations, which target software while allowing chip exports, could severely undermine the competitive position of the US in global AI development.