The U.S. Department of Commerce lifted export controls on Anthropic's most powerful models, Claude Fable 5 and Mythos 5, on June 30, 2026. Following the decision, Anthropic restored global access to Fable 5 on Wednesday, July 1, across the Claude platform, Claude.ai and Claude Code, ending an outage that had lasted about two and a half weeks.
The controls had taken effect on June 12. The trigger was a jailbreak — a prompt technique that gets a model to bypass its safety rules — which Amazon researchers had found in Fable 5. The order required Anthropic to cut off both models for any foreign national inside or outside the United States. Because the company could not verify every user's nationality in real time, it shut both models down for everyone.
To address the concern, Anthropic trained a new safety filter, known as a classifier, that watches for the specific technique described in the report and blocks it. The company says the filter now stops that technique in more than 99% of attempts. Meeting this condition cleared the way for the model's return. Fable 5, positioned at the Mythos tier above the Opus class, had first been introduced to the public on June 10.
After the restoration, Anthropic made Fable 5 available for up to 50% of weekly usage limits through July 7 for Pro, Max, Team and selected enterprise plans. The episode renewed debate over the tension between national security oversight of advanced AI models and their commercial availability. The speed with which the controls were imposed and then withdrawn also fueled discussion about regulatory uncertainty in the sector.