Which AI companies' models can the UK AI Security Institute access again?

Models from Anthropic, Google DeepMind, and OpenAI. The agency tests AI systems for safety risks before they ship.

What had Anthropic done during the block?

Anthropic restricted access to its new Claude Mythos 5.1 model. That restriction is being lifted along with the block.

What else is AI Minister Kanishka Narayan planning?

He plans to announce new AI safety measures in an upcoming speech. These include stricter reporting requirements for AI-related security incidents involving critical infrastructure.

What did UK security chiefs warn about?

The heads of MI6, MI5, and GCHQ had warned ministers that AI was empowering hostile actors and terrorists.

AI Safety & AlignmentAI Regulation & PolicyTHE DECODER3m agoOct 13, 2026, 01:00 JST

White House restores AI Security Institute access to Anthropic, OpenAI models

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3 Key Points

What happened
The White House lifted its September block, letting the UK AI Security Institute again test new models from Anthropic, Google DeepMind, and OpenAI before they ship.
Why it matters
The reversal follows diplomatic pressure and restores pre-release safety testing that had been cut off. Anthropic had already restricted access to its new model during the block.

WHO IT HITSUK government safety testers regain pre-release access to frontier models, while AI companies shipping to the UK face forthcoming stricter incident-reporting rules.

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Context & Analysis

The reversal caps months of tension over who gets to inspect frontier AI models before release. In September, the Trump administration told Anthropic, Google DeepMind, and OpenAI to stop sharing their models with the UK's AI Security Institute, and Anthropic limited access to its new Claude Mythos 5.1 model in response.

The episode unfolded against a wider split over AI governance. Prime Minister Andy Burnham had pushed for international AI regulation at the UN General Assembly, while Trump warned at the same event that "globalist" organizations should stay out of American AI development. The heads of MI6, MI5, and GCHQ had also warned ministers that AI was empowering hostile actors and terrorists.

AI Minister Kanishka Narayan's diplomatic push reopened the channel, and he now plans to announce new AI safety measures in an upcoming speech, including stricter reporting requirements for AI-related security incidents involving critical infrastructure.

FAQ

Which AI companies' models can the UK AI Security Institute access again?: Models from Anthropic, Google DeepMind, and OpenAI. The agency tests AI systems for safety risks before they ship.
What had Anthropic done during the block?: Anthropic restricted access to its new Claude Mythos 5.1 model. That restriction is being lifted along with the block.
What else is AI Minister Kanishka Narayan planning?: He plans to announce new AI safety measures in an upcoming speech. These include stricter reporting requirements for AI-related security incidents involving critical infrastructure.
What did UK security chiefs warn about?: The heads of MI6, MI5, and GCHQ had warned ministers that AI was empowering hostile actors and terrorists.

THE DECODERRead Original Article

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