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White House tells OpenAI, Anthropic to hold new models from UK safety testers

Politico reports the administration wants first access to frontier AI models before Britain's AI Security Institute, and Anthropic appears to comply.

newest coverage 5h agosummary written 1d ago33 pieces62 likes & upvotes14 comments NewswiresMastodonXRedditGoogle NewsBluesky

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What to know

  • The White House quietly asked OpenAI and Anthropic to withhold new frontier AI models from the UK's AI Security Institute until US government reviewers see them first.
  • Anthropic appears to have agreed, delaying its Claude Mythos 5.1 model for UK testers; OpenAI's compliance is unconfirmed.
  • The move comes as UK leaders push for shared global AI testing principles, highlighting tension in US-UK AI safety cooperation.
  • Coverage so far is limited to Politico's sourcing and wire pickups, with no on-record confirmation from OpenAI, Anthropic, or the White House.

White HouseWhite House US executive branchOpenAI AI labAnthropic AI labUK AI Security Institute (AISI) UK government AI safety testing body

White House tells OpenAI, Anthropic to hold new models from UK safety testers
x.com

How it unfolded 5 developments, newest first · click a bar or a number to jump articlesposts

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yesterday8 AM4 PMtoday8 AMnow · 2:50 PM ET
  1. 5

    Commentator mocks strain on US-UK 'special relationship'

    A Mastodon post reacting to the Politico report sarcastically declared the US-UK intelligence and diplomatic partnership over the AI-testing dispute.

    “Five Eyes is OVER! Special Relationship is FINISHED!”
    — kevincollier.bsky.social

    • The White House has asked OpenAI and Anthropic not to share their AI models with the U.K. government’s testing agency until the models have gone through U.S. testing, per POLITICO

      @unusual_whalesX21h ago33▲view on X ↗
    2 more of the top 3 · 5 posts in this stretch
    • michelesgreenbook.bsky.social

      So, Trump and his regime, who claim to be the most transparent government in history, are telling OpenAI and Anthropic to withhold (hide) new AI models from the UK’s flagship testing agency. What is Trump trying to hide now? SOURCE: @bloomberg.com

      michelesgreenbook.bsky.socialBluesky5h ago2▲view on Bluesky ↗
    • AAKL@infosec.exchange

      What the ... Dear rest of the world: in case you haven't noticed (pretty sure you haven't), you've already been co-opted. Politico: White House asks OpenAI and Anthropic to hold new models from UK testers until US review https://www. politico.com/news/2026/09/24/w…

      AAKL@infosec.exchangeMastodon1d agoview on Mastodon ↗
    all of them →
  2. 4

    Wire services pick up the Politico report

    Channel News Asia and Investing.com/Reuters republished the Politico findings, spreading the story beyond its original outlet without adding new facts.

    • The White House has asked OpenAI and Anthropic not to share new AI models with the U.K.'s AI Security Institute until the models have gone through U.S. government testing first, according to POLITICO. Anthropic appears to have complied, saying its Claude Mythos 5.1 model was

      @FaytuksNetworkX1d ago12▲view on X ↗
  3. 3

    Social media frames move as US demanding first look before Britain

    News aggregation accounts characterized the request as the White House demanding to see new frontier models before the UK does, amplifying the story on social platforms.

    “The White House is making a rather consequential demand of America’s biggest AI labs: show us the new models before you show Britain.”
    — @MarioNawfal

    • 🇺🇸🇬🇧 The White House is making a rather consequential demand of America’s biggest AI labs: show us the new models before you show Britain. The administration asked OpenAI and Anthropic not to give new frontier models to the U.K.’s AI Security Institute until they have first been

      @MarioNawfalX1d ago15▲view on X ↗
    1 more of the top 2 · 2 posts in this stretch

    • We don't have the money. Every single part of building AI in the UK is horrifically expensive.

      Ivashkinr/ukpolitics1d agoview on r/ukpolitics ↗
    all of them →
  4. 2

    Commentators criticize the move as unnecessary friction

    Individual commentators on social media questioned the value of the policy, with one calling it pointless and another sarcastically suggesting it strains the US-UK relationship.

    “This seems like a dumb waste of time: White House asks OpenAI and Anthropic to hold new models from UK testers until US review…”
    — @kevinbankston

    • This seems like a dumb waste of time: White House asks OpenAI and Anthropic to hold new models from UK testers until US review https://subscriber.politicopro.com/ ...

      @kevinbankstonX1d agoview on X ↗
  5. background

    Anthropic appears to comply, delays Claude Mythos 5.1 for UK testers — Follow-up Politico reporting indicated Anthropic appears to have agreed to the White House's request, holding its Claude Mythos 5.1 model back from the UK's AI Security Institute pending US review.

  6. 1

    Politico reports White House holding models back from UK testers

    Politico revealed the White House asked OpenAI and Anthropic not to share new frontier models with the UK's AI Security Institute until they undergo US government review first, even as UK leaders push for shared global testing principles.

    1. 4 outlets White House asks OpenAI and Anthropic to hold new models from UK testers until US review, sources say.

      first by Business Insider, 22h ago · also The Hindu, The Decoder, Quartz

      3 more headlines

    2. 4 outlets first by Investing.com News, 1d ago · also Channel News Asia, Reuters, U.S. News & World Report · read ↗

    2 more claims →

Also covered reported alongside — the timeline has no entry for these yet

  1. 2 outlets Trump Tells OpenAI, Anthropic to Withhold Models From UK Agency

    first by Bloomberg Tech, 5h ago · also Bloomberg

What people are saying 2 voices from 1 site · best of 9 · verbatim