Claude Fable 5 US Export Ban Guide: What Developers Need to Know in 2026
On June 12, 2026 at 5:21 PM ET, the US Commerce Department ordered Anthropic to disable Claude Fable 5 and Mythos 5 for every foreign national on the planet — including foreign nationals working inside Anthropic’s own US offices. Anthropic had no real-time nationality verification in its API pipeline. Within 90 minutes, both models were offline for all users everywhere. No grace period. No migration window. No workaround. If you built any production workflow against claude-fable-5 during its 72-hour public window, your application broke that evening. ...