Anthropic restores Claude Fable 5 after US restrictions lifted

Anthropic restored global access to Claude Fable 5 on Wednesday after conversations with the US government led to the lifting of export controls that had forced the company to suspend the model in June.

Fable 5 is back. pic.twitter.com/9RTGUCcPHy

— Claude (@claudeai) July 1, 2026

The restrictions were introduced on June 12 and applied to foreign nationals both inside and outside the US. Anthropic disabled Fable 5 and Mythos 5 for all users because it lacked a reliable way to verify nationality in real time. The controls were lifted on June 30.

Anthropic said it has introduced an updated cybersecurity classifier designed to block the behavior that prompted the government action. Requests flagged by the system will be redirected to Claude Opus 4.8, with users notified when the fallback occurs.

The new safeguards block the reported bypass in more than 99% of tested cases, according to the company. However, Anthropic warned that the system may initially flag a slightly higher number of harmless coding and debugging requests while it works to reduce false positives.

Anthropic said the model’s biology and chemistry classifiers remain unchanged and may still redirect basic biology related questions to Opus 4.8. The company plans to release improvements to those classifiers in the coming weeks.

Fable 5 is temporarily included for Pro, Max, Team and eligible Enterprise users through July 7. Customers can use the model for up to 50% of their regular weekly usage allowance before switching to another model or paying through usage credits.

The model is available through Claude on the web, mobile and desktop, as well as Claude Code, Cowork and other supported Claude products. API usage remains separately billed at standard rates.

Anthropic has also restored Mythos 5 access to a limited group of US organizations approved by the government. The company said it is continuing discussions to expand access to other domestic and international partners involved in Project Glasswing.

The company is also working with Amazon, Microsoft, Google and other partners on a shared framework for measuring the severity of model jailbreaks, following the dispute that led to Fable 5 being temporarily removed.

Disclosure: This article was edited by Estefano Gomez. For more information on how we create and review content, see our Editorial Policy.