Fable 5 Export Ban Was Triggered by 'Fix This Code', Not a Jailbreak

The Register / Hacker News·high signal

Per The Register (June 15), the incident behind the US export-control block on Anthropic's Fable 5 and Mythos 5 was a plain three-word 'fix this code' prompt on CVE-laced source, not a guardrail bypass. Katie Moussouris — the only external expert to read the underlying report — calls it the ordinary find-fix-test loop defenders run daily. The June 12 directive is the first documented use of US export control against a commercially deployed model's access (no allied-exemption mechanism in BIS rules), and Anthropic disabled both models for all users — a precedent builders should weigh when betting on a single frontier provider.