The Fable 5 export control ban issued by the US government has forced Anthropic to suspend its two most capable AI models, Fable 5 and Mythos 5, for all users worldwide, including customers in the UK and every other country that had been accessing them.
The directive arrived at Anthropic at 5:21pm ET on 12 June, citing “national security” authorities. It bars access to both models by any foreign national, whether inside or outside the United States, and explicitly includes Anthropic’s own foreign-national employees. The company’s conclusion was swift and unambiguous: with a workforce and customer base that spans the globe, the only compliant path was to disable both models for everyone.
A Commerce Department Order Signed by Lutnick
The directive was issued through the Bureau of Industry and Security, and according to the Cloud Security Alliance Lab Space, it carried the signature of Commerce Secretary Howard Lutnick and was addressed to Anthropic chief executive Dario Amodei. That routing, through BIS rather than a more conventional channel, is telling: BIS governs export controls on dual-use technologies, and framing an AI model as an export-controlled item sets a precedent the industry will be watching closely.
All other Anthropic models, including Claude Opus 4.8, remain unaffected. The two pulled models are not interchangeable, though they share the same underlying architecture. Fable 5 is the safety-layered version, designed to block or divert sensitive queries in areas such as cybersecurity, biology, and chemistry. Mythos 5, the unrestricted sibling, is limited to vetted government cyberdefenders and life sciences partners. Neither is currently available to anyone.
The Fable 5 Export Control Ban Lands Mid-Launch
The timing is particularly awkward for Anthropic. Fable 5 had only begun rolling out on 9 June, offered free to all Pro, Max, and Enterprise customers through 22 June. Three days into what was effectively a high-profile public debut, the model is now offline for the very customers it was handed to. In a developer notice, Anthropic said new sessions would fall back to a user’s default model or Opus 4.8, existing Fable 5 sessions would end with an error, and platform API requests to Fable 5 would fail. Integrators were told to migrate to other models immediately.
UK Minister for AI and Online Safety Kanishka Narayan MP acknowledged that customers in both the US and UK were affected, framing the disruption as a case for technological sovereignty and pointing to the government’s £1.1bn AI chip investment as relevant context.
Anthropic Disputes the Jailbreak Justification
Anthropic’s own reading of why the order was issued centres on a reported method to jailbreak Fable 5. The company says it reviewed a demo of the purported bypass and found only minor, already-known bugs of the kind other publicly available models can surface without any special technique. Its position, stated publicly, is direct: “To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws.”
“Our understanding is that one potential jailbreak was shared with the government,” Anthropic added. The company says it disagrees that a narrow potential jailbreak should justify recalling a model deployed to hundreds of millions of people, and it took direct aim at the wider implications: “If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers.”
Anthropic also pointed to OpenAI‘s GPT-5.5 as an example of a model with comparable capabilities that remains available, arguing the underlying capability is already widely accessible and used by defenders every day. The company maintains the order stems from a misunderstanding rather than a genuine security finding.
Anthropic says it is working to restore access and has promised further details within 24 hours of the suspension. The directive as it stands, however, requires the Fable 5 export control ban to remain in place until the government is satisfied, and Anthropic has not yet said what that threshold looks like.
