US government orders Anthropic to disable Claude Fable 5 and Mythos 5

The U.S. government ordered Anthropic to disable Claude Fable 5 and Claude Mythos 5 worldwide, citing national security concerns over a claimed jailbreak. Mythos 5 had been restricted to ~50 vetted organizations for defensive cybersecurity work. Anthropic complied but stated the reasoning was based on a 'narrow potential jailbreak.'