White House reportedly seeks U.S. review before new AI models reach UK testers

The White House has reportedly asked OpenAI and Anthropic to withhold new AI models from British testers until a U.S. security review is completed, according to Politico.
The reported request highlights the growing role of national-security reviews in the international deployment of frontier AI systems and could temporarily affect how new models are shared with overseas testing partners.
The measure is reported rather than a confirmed permanent restriction, and its broader impact will depend on the scope and outcome of the U.S. review.