The Trump administration is pressuring OpenAI and Anthropic to limit the United Kingdom’s access to their most advanced artificial intelligence models. In June 2026, the US Commerce Department imposed export controls on Anthropic’s Fable 5 and Mythos 5 models, forcing the company to suspend global access to these systems. OpenAI also restricted access to its GPT-5.6 Sol model to US-approved organizations only. By September 2026, Anthropic declined to grant pre-release access to its Claude Mythos 5.1 model to the UK’s AI Security Institute, a first in the context of existing collaboration agreements. The British government sought an exemption but Washington issued a flat rejection, citing national security concerns.
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