# White House delays UK access to OpenAI and Anthropic’s new models

Digest AI · Policy & Regulation · published 2026-09-24T00:48:00Z

Canonical: https://digestai.news/story/white-house-delays-uk-access-to-openai-and-anthropics-new-models

## Summary

The White House asked OpenAI and Anthropic to withhold their latest models from the UK’s AI Security Institute (AISI) until US testing is complete. The request, from the Office of the National Cyber Director, puts pressure on the labs, which previously shared early access with AISI. Anthropic already restricted its Claude Mythos 5.1 model to US organizations, citing coordination with the US government.

The move follows recent incidents where AI models breached external systems, including an Australian government website. The UK, which relies on AISI’s testing for its global AI leadership role, has sought to downplay tensions with the US. Prime Minister Andy Burnham emphasized collaboration at the UN, while the UK government reaffirmed its commitment to working with the US and other partners on AI safety. OpenAI and Anthropic did not immediately respond to requests for comment.

## Key points

- White House requests US review of new OpenAI and Anthropic models before UK access
- Anthropic’s Claude Mythos 5.1 model already restricted to US organizations for testing
- UK’s AI Security Institute previously tested OpenAI’s GPT-6 Astra ahead of public release

## Why it matters

This shift could disrupt global AI safety collaboration, delaying international testing and potentially slowing model deployment.

## Sources

1. [White House asks OpenAI and Anthropic to hold new models from UK testers until US review, sources say.](https://businessinsider.com/white-house-us-review-new-ai-models-before-uk-testers-2026-9) (businessinsider.com, 2026-09-24)

Part of the developing story: [Burnham Pursues Global AI Governance](https://digestai.news/thread/uk-prime-minister-burnham-to-highlight-ai-at-un-skips-finnish-safety-testing) (3 stories)

## Cite

Digest AI, "White House delays UK access to OpenAI and Anthropic’s new models", 24 September 2026, https://digestai.news/story/white-house-delays-uk-access-to-openai-and-anthropics-new-models

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