Claude Fable 5 suspended by U.S. export controls. Before it returns: handle stop_reason: refusal (200 OK), use the effort parameter, wire fa

Claude Fable 5 hit 95% SWE-bench Verified before the US government forced a global shutdown 72 hours after launch. Benchmarks, API details, and what to do now.

Anthropic disabled Claude Fable 5 and Mythos 5 on June 12 under a US export order over a jailbreak. What happened, why, and the Opus 4.8 fallback I us