# Anthropic says the jailbreak behind Fable 5 shutdown was code review > Source: > Published: 2026-06-13 19:56:53+00:00 Anthropic disabled Claude Fable 5 and Claude Mythos 5 for all customers after a U.S. export control directive, then disputed the technical basis for the shutdown by saying the government's evidence was, so far, only verbal and centered on a prompt that asked the model to read a codebase and fix flaws. For Dario Amodei, Anthropic's co founder and CEO, the confrontation lands at the fault line of the company he and Daniela Amodei built: sell the most capable AI systems it can, argue that they r...