Signal US Commerce Dept lifts export controls, Claude Fable 5 fully restored after 19-day shutdown

Summary

US export control measures imposed on 12 June 2026 suspended the Fable 5 and Mythos 5 services after Amazon researchers discovered a jailbreak technique bypassing Fable 5's cybersecurity safeguards, which Amazon CEO Andy Jassy reported to federal authorities. Anthropic co-founder Tom Brown led the company's negotiations with the Commerce Department, headed by Secretary Howard Lutnick. The Commerce Department lifted the restriction 19 days later on 30 June, with global rollout resuming on 1 July across the Claude Platform, Claude.ai, Claude Code, Claude Cowork, AWS, Google Cloud and Microsoft Foundry. Anthropic said it had retrained its safety classifier so the reported jailbreak technique is now blocked in more than 99% of cases. Mythos 5, which carries additional cybersecurity capabilities, remains limited to approved US organizations following government review. The episode was reported as a lesson for enterprises that treat AI as infrastructure.