Sources: the White House asked OpenAI and Anthropic not to share new models with UK's AISI until US reviews them; Anthropic appears to have agreed (Politico)

The White House requested that OpenAI and Anthropic refrain from delivering new AI models to the UK’s Artificial Intelligence Safety Institute until U.S. regulators complete their review. Anthropic has confirmed it will comply with the restriction. This move follows concerns about the rapid deployment of advanced models without thorough oversight.