UK AI Sovereignty Takes a Double Hit as Washington Gatekeeps Models and Power Grids Refuse to Cooperate

The White House has dropped a sovereignty bomb on the UK's prized AI Safety Institute. Washington's Office of the National Cyber Director told OpenAI and Anthropic to withhold their latest frontier models from the British watchdog until the US government has tested them first. Anthropic has already complied — its newest Claude Mythos 5.1 model remains locked out of AISI's testing labs. The move threatens to downgrade Britain from early-access partner to second-tier observer in the...