Removal of Export Restrictions: Claude Mythos 5 Gains Access to 100 Organizations in the US, Fable 5 Set for Release
On Friday, the U.S. Department of Commerce officially lifted the export ban on Anthropic's artificial intelligence model, Claude Mythos 5. This landmark decision opens access to cutting-edge technology for over 100 American organizations, including major corporations and government agencies.
This move is the result of two weeks of negotiations between the Trump administration and Anthropic's leadership. Previously, the model's export was blocked due to national security concerns, but restrictions have now been lifted. Commerce Secretary Howard Lutnick explained in a letter to Anthropic's Chief Technology Officer Tom Brown that current precautionary measures allow trusted partners to access Mythos 5 without needing a special license.
Return of Mythos and Delay of Fable 5
Earlier, both models — Mythos and Fable 5 — were disabled after Anthropic's key investor, Amazon, expressed concerns about their safety. Company researchers warned that Fable 5 could be hacked for potentially dangerous purposes. However, Mythos is now back in action: until now, the model was used exclusively within the Glasswing program, which involved about 150 organizations from 15 countries. Notably, Mythos previously identified vulnerabilities in classified systems within just a few hours during government testing.
As for Fable 5, its release to the general public is being postponed. Unlike Mythos, access to this model was previously open to all subscribers, and for a time it was considered the most powerful public AI tool. Now, the release process has stalled, and exact timelines have not been announced.
New AI Regulatory Regime
The situation is gradually shaping a new system of restrictions. On June 2, an executive order was signed that opens a voluntary channel for federal review of advanced AI models. Developers can submit their solutions for cybersecurity checks 30 days before launch. This complements the tightening of AI chip exports to China, which Washington has been pursuing over the past year.
OpenAI has also followed this path: on Friday, the company restricted access to the most powerful version of GPT-5.6, called Sol, providing it only to about 20 partners who received government approval. The weaker versions, Terra and Luna, became available to the general public.
Initially, the blockages were caused by concerns that the technology could reach China. Attention was focused on South Korean operator SK Telecom, which was added to the Glasswing list in early June and then had its access restricted. SK Telecom denied any connection to China.
Many leaders of major cybersecurity companies, including former Facebook security chief Alex Stamos, urged authorities to abandon restrictive measures. An open letter was signed by leaders from Nvidia, Adobe, Zoom, and other companies.
Countries in Europe and other regions note that they have become heavily dependent on Washington's decisions regarding access to new developments. Whether Fable 5 will receive similar permissions will likely become clear in the coming days.
Expert opinion: Lifting restrictions on Mythos 5 signals that the U.S. aims to maintain technological leadership while tightening control over the distribution of the most powerful AI models. The cryptography and cybersecurity market should closely monitor developments: access to tools like Mythos could radically change the landscape of vulnerability discovery and data protection.