In brief: Anthropic must block two frontier models globally for foreign users but disputes the regulatory basis for this measure.
The US government has instructed Anthropic to block Fable 5 and Mythos 5 for all foreign nationals. Anthropic is implementing the order but criticizes the rationale as too narrowly scoped.
The US government has required Anthropic to block Fable 5 and Mythos 5 for all foreign nationals. This forces the company to cut off both models from foreign users’ access worldwide.
While Anthropic has agreed to comply with the order, it criticizes the government’s rationale. The company argues that the cited security vulnerability (jailbreak) is based on a narrow use case and that similar capabilities are already available in other models.
The measure demonstrates the growing importance of export control regulations in the AI models sector. The US government classifies advanced frontier models as sensitive and prevents their international availability to maintain strategic advantages. For CTOs, this means that even leading models can be subject to regulatory restrictions that complicate worldwide deployments.
Source: www.bleepingcomputer.com · Published June 13, 2026
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