The United States reversed on October 11, 2026 a three-week directive that had barred the UK from testing AI models before their release. This 17-day pause, imposed on September 24 by the Trump administration, was meant to await the completion of a US national security review. Britain’s AI Security Institute (AISI) regained access to pre-release systems from Anthropic, Google DeepMind, and OpenAI, following lobbying by UK AI minister Kanishka Narayan. During the suspension, Anthropic released its Claude Mythos 5.1 model exclusively to US organizations. The future of this arrangement now hinges on formalization, with AI labs calling for a more predictable framework.
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