White House Restores UK Access to Frontier AI Models After 17-Day Freeze

The Trump administration has reversed a Sept 24 directive that told OpenAI and Anthropic to stop sharing unreleased frontier models with Britain's AI Security Institute pending a US national-security review. Access was restored Oct 11 after 17 days, following lobbying by UK AI minister Kanishka Narayan and other ministers, the Telegraph reported, and covers pre-release systems from OpenAI, Anthropic and Google DeepMind. During the freeze, Anthropic released Claude Mythos 5.1 only to US organizations through trusted-access programs, and it remains unclear whether the US review concluded or what it found.