White House asks OpenAI and Anthropic to withhold new models from U.K. testers pending U.S. review
Politico reports the White House, via the Office of the National Cyber Director, asked OpenAI and Anthropic to delay sharing new AI models with the U.K.'s AI Safety Institute (AISI) until U.S. agencies can review them; Anthropic has restricted Claude Mythos 5.1 access to U.S. organizations. The report notes AISI has had early access to frontier models (including tests of OpenAI's GPT-6 Astra) and that the U.S. Center for AI Standards and Innovation (CAISI) currently lacks a permanent director and has limited staff.