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Statement on the US government directive to suspend access to Fable 5 and Mythos 5

02:00 · June 12, 2026 · Anthropic News

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

Summary

The US government has directed Anthropic to suspend access to its Fable 5 and Mythos 5 models for all foreign nationals, including those employed by the company inside or outside the United States. To meet the terms of the export control order, Anthropic has disabled the two models for every customer worldwide, while leaving its other models unaffected. The directive was delivered at 5:21 p.m. ET and invoked national security authorities, yet it supplied no written technical details.

Anthropic states that the government’s concern centers on a reported jailbreak technique that could allow users to bypass safeguards in Fable 5. After examining the demonstration, the company concluded that the method merely surfaces a small set of previously known, low-severity vulnerabilities that other publicly available models, including OpenAI’s GPT-5.5, can already identify without any special bypass. The company views the capability as routine for security researchers who routinely scan codebases for flaws.

Anthropic is complying with the order but maintains that a narrow, non-universal jailbreak does not justify withdrawing a model already in wide commercial use. It argues that applying the same standard across the industry would effectively block new frontier-model releases. The company has called for any future government interventions to follow a transparent statutory process grounded in verifiable technical evidence rather than verbal briefings.

Access remains unavailable while Anthropic seeks clarification and works to restore service. The episode highlights the immediate operational impact of export controls that extend to model weights and inference endpoints rather than hardware alone.

Why it matters

This is highly relevant for Dutch product teams and builders as it announces the immediate, global shutdown of Anthropic's Fable 5 and Mythos 5 models due to US export controls. Teams relying on these models must urgently migrate to alternative solutions to maintain their AI applications.

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