White House Directs OpenAI, Anthropic to Block UK Testers From New AI Models Until US Review

The White House has asked OpenAI and Anthropic to delay releasing new frontier AI models to the UK's government testing authority until the United States completes its own security evaluation, according to reporting from Politico on September 24. The request, issued by the Office of the National Cyber Director, reflects a significant shift in how the US government manages access to the most powerful AI systems among allied nations.