Anthropic is bringing Claude Fable 5 back online globally on Wednesday, nearly three weeks after a U.S. export control directive forced it offline on June 12, as the U.S. Commerce Department lifted the export controls on Fable 5 and Mythos 5 as of June 30. The shutdown followed a jailbreak report from Amazon researchers who bypassed Fable 5's guardrails to identify software vulnerabilities, with one case producing code demonstrating how to exploit one. Anthropic built a new safety classifier that blocks the reported jailbreak technique in over 99% of cases, and any flagged Fable 5 request gets rerouted to Claude Opus 4.8. Researchers at the Commerce Department's Center for AI Standards and Innovation reviewed the safeguards and called them extraordinarily strong. Mythos 5 will remain limited to vetted partners. Access details vary by plan: Pro, Max, Team, and select Enterprise subscribers get Fable 5 included for up to half their weekly usage limits through July 7, after which it shifts to usage credits. Anthropic is also drafting a jailbreak-severity framework with Amazon, Microsoft, and Google, and pledged earlier government access to future frontier models before release.