Washington asked OpenAI and Anthropic PBC to pause sharing their latest AI models with the UK's flagship testing body until a U.S. review takes place. Politico first reported the move, and a British official confirmed that account to Bloomberg. The stated aim is to check that U.S. models are secure before sending them to partners such as the UK.
OpenAI offered no comment, and neither Anthropic nor the White House replied right away to inquiries. Earlier this year, the U.S. government barred Anthropic from making its newest models available to any foreign national.
The timing complicates Prime Minister Andy Burnham's effort to cast the UK as honest brokers among major players shaping AI. During this week's United Nations General Assembly in New York, he promoted Britain's AI Security Institute as a prospective frontrunner in AI regulation and safety. Speaking to reporters ahead of his Tuesday meeting with President Trump, he said he is looking for the sweet spot that advances AI development while also keeping its use safe. He later told business leaders he wants a "single set of global principles and standards" to protect against the tech. Trump dismissed talk of worldwide AI rules as a "globalist scheme."
UK officials sought to tamp down concerns, saying cooperation with the U.S. remains close and emphasizing Britain's continued standing. In a statement, the British government said: "The UK is a world leader in AI security, and the AI Security Institute continues to work closely with the US government, international partners and leading AI companies, including OpenAI and Anthropic," adding, "These risks do not stop at national borders and no country can tackle them alone."
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The shift in U.S. policy follows warnings from leading AI figures about a credible threat to humanity if powerful systems advance without safety vetting. Trump has waved away those concerns and rejected proposals to coordinate regulatory efforts.
The UK's AI Security Institute was created three years ago and is described as the world's best-funded government-backed AI body. Its clout is being tested. According to an earlier Bloomberg report, Anthropic declined to provide the institute with the newest release of its powerful Mythos model, offering no explanation.
Safety worries also intensified this week after Australian Prime Minister Anthony Albanese said an OpenAI model obtained entry to documents on a government site without authorization, marking one of the earliest known cases of an AI agent carrying out an unsanctioned breach at a public agency.
Access and testing rights can shape how quickly cutting-edge AI turns into usable products, which affects everything from enterprise software adoption to where talent and capital flow. If timelines stretch or fragment across borders, expect product rollouts to vary by market and compliance costs to rise, which can ripple into the valuations of AI suppliers and their customers.
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