Redeploying Fable 5
Anthropic is redeploying Claude Fable 5 starting July 1 following the lifting of export controls, with updated cybersecurity safeguards and a new industry jailbreak framework. Announcements Redeploying Fable 5 Jun 30, 2026 On Friday, June 12, the US government applied export controls to our newest models, Claude Fable 5 and Claude Mythos 5. This required us to restrict access to foreign nationals, whether inside or outside the United States.
Key Takeaways
- Because the order took effect immediately and we had no reliable way to verify nationality in real-time, we suspended access to both models for all users.
As of today, June 30, the export controls on Fable 5 and Mythos 5 have been lifted .
- We continue to coordinate with the government to expand access to the broader set of domestic and international partners in the Glasswing program.
In the remainder of this post, we provide further details and updates in four areas: A timeline of events, including updates we made to our safeguards .
- 2 A shared standard for judging the severity of a given jailbreak would help AI developers triage new findings as they arise, launch highly-capable models with greater safety, and communicate the level of risk consistently to government and industry partners.
Together with Amazon, Microsoft, Google, and other Glasswing partners, we've started to develop such a framework, and we outline it below.
- They both share the same underlying model, but Fable 5 was released with strong safeguards to make it safer for general use.
Mythos 5, which has fewer safeguards, was only released to a small number of trusted Project Glasswing partners for use in defensive cybersecurity.
- When it came to the demonstration of how to exploit the single vulnerability, every model we tested could produce the same demonstration as Fable 5 (including Claude Haiku 4.
Stats & Key Facts
- #Announcements Redeploying Fable 5 Jun 30, 2026 On Friday, June 12, the US government applied export controls to our newest models, Claude Fable 5 and Claude Mythos 5.
- #We have also restored access to Mythos 5 for a set of US organizations, following the US government's approval on June 26 .
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