Question to the Cabinet Office:

To ask the Minister for the Cabinet Office, what assessment the Government has made of the adequacy of the AI Security Institute’s access arrangements with frontier AI developers following reports concerning Claude Mythos 5.1; whether the Minister will publish, for each of Anthropic and OpenAI, the number of models for which pre-release access was requested, granted, delayed or refused since 1 January 2026; what minimum evaluation time the Institute sought and whether that time was provided; what restrictions applied to testing or communicating findings to Ministers and Parliament; and what steps are available to the Government where a developer does not provide the access sought.

I refer the Hon Member to my answer to PQ 29988.