U.K. regains access to OpenAI and Anthropic AI models pre-release

The U.K.'s AI Security Institute will resume receiving access to the most powerful AI models from OpenAI and Anthropic before their public release, AI Minister Kanishka Narayan announced on Monday, reversing a U.S. policy that had cut off such access.

Narayan credited lobbying efforts and recent conversations between ministers and tech executives — facilitated in part by a summit with King Charles III — for securing the change, according to Bloomberg. The Telegraph first reported the policy reversal, according to LBC.

The Trump administration had told OpenAI and Anthropic to withhold their models from the U.K.'s AI Security Institute until U.S. authorities cleared them, according to Bloomberg. That policy led Anthropic to stop British officials from reviewing its Claude Mythos 5.1 model, according to LBC, and Anthropic did not provide an explanation for withholding the model, according to Bloomberg.

"I'm very confident that, as a consequence of the conversations we've had, we will be able to test the latest generation of models," Narayan told Bloomberg. He also acknowledged the limits of the arrangement: "When you're reliant on someone else's technology, you have to be clear-eyed about the permanence of any outcome."