{"schema":"postcutoff/event@1","as_of":"2026-11-15T00:33:00+01:00","url":"https://postcutoff.com/e/2026-09-24-white-house-asks-labs-withhold-models-uk-aisi/","md":"https://postcutoff.com/e/2026-09-24-white-house-asks-labs-withhold-models-uk-aisi/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-09-24-white-house-asks-labs-withhold-models-uk-aisi","date":"2026-09-24","date_precision":"day","short_title":"White House asks OpenAI and Anthropic to hold new models back from the UK AI Security Institute until the US reviews them","deck":null,"takeaway":"Politico reported on Sept 24, 2026 that the White House Office of the National Cyber Director asked OpenAI and Anthropic not to give new models to the UK's AI Security Institute for pre-release testing until US agencies had reviewed them.","category":"policy-safety","category_label":"Policy & safety","importance":4,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":[{"n":1,"title":"Politico: White House asks OpenAI and Anthropic to hold new models from UK testers until U.S. review","url":"https://www.politico.com/news/2026/09/24/white-house-asks-openai-and-anthropic-to-hold-new-models-from-uk-testers-until-u-s-review-01091769","type":"press","group":"press","domain":"politico.com"},{"n":2,"title":"The Next Web: White House wants US review before UK AI Security Institute tests","url":"https://thenextweb.com/news/white-house-openai-anthropic-uk-ai-security-institute-models","type":"press","group":"press","domain":"thenextweb.com"},{"n":3,"title":"Digital Watch Observatory: US asked OpenAI, Anthropic to hold AI models from UK","url":"https://dig.watch/updates/us-asked-openai-anthropic-ai-models-uk-us-review","type":"press","group":"press","domain":"dig.watch"},{"n":4,"title":"Reuters via Economic Times: US reverses course on Britain's testing of AI models (Oct 11)","url":"https://economictimes.indiatimes.com/tech/artificial-intelligence/us-reverses-course-on-britains-testing-of-ai-models/articleshow/134882085.cms","type":"press","group":"press","domain":"economictimes.indiatimes.com"}],"official":0,"filed":"2026-09-29","updated":"2026-10-12","orgs":["White House","OpenAI","Anthropic","UK AI Security Institute"],"title":"White House asks OpenAI and Anthropic to hold new models back from the UK AI Security Institute until the US reviews them","summary":"Politico reported on Sept 24, 2026 that the White House Office of the National Cyber Director asked OpenAI and Anthropic not to give new models to the UK's AI Security Institute for pre-release testing until US agencies had reviewed them. Anthropic appears to have complied: Claude Mythos 5.1 is available only to US organizations. The request broke with the voluntary UK pre-deployment testing that labs had used since 2023.","key_facts":["Request came from the Office of the National Cyber Director (ONCD), the White House cyber-policy office","Anthropic: Mythos 5.1 is 'only available to a set of U.S. organizations'; 'We're coordinating with the U.S. government to expand access to a broader set of domestic and international partners as quickly as possible'","OpenAI declined to comment; UK AISI had had pre-release access to GPT-6 Astra (The Next Web)","Senior administration official (Politico): the US wants its systems secure before sharing with international partners, as these are American companies","UK government: 'These risks do not stop at national borders and no country can tackle them alone'","Update (Oct 11): the Telegraph reported that the administration reversed the request and US labs may again give AISI pre-release access (Reuters); see 2026-10-11-us-restores-uk-aisi-pre-release-model-access"],"key_numbers":[],"tags":["policy","us-government","uk","aisi","pre-deployment-testing","evaluations","international"],"science":null,"body_md":"## What happened\n\nThe ONCD request, reported by Politico and followed by Bloomberg, asks the two labs to route their newest models through US government review before\nthe UK institute sees them. Anthropic had already limited Mythos 5.1 to US organizations. The UK government answered with a general call for\ninternational cooperation. The same week, reports said UK AISI staff were under strain from tight release schedules (FT, Sept 22).\n\n## Why it matters\n\nIndependent pre-deployment testing by the UK institute was one of the few working international safety mechanisms. Putting a US gate in front of it\ntreats frontier models as national-security assets and weakens the \"international testing\" pillar that the labs themselves proposed at the UN the\nsame week.\n\nCaveat: based on anonymous sources in Politico; the exact terms of the request and OpenAI's decision were not public.","disputed":[],"related":[{"id":"2026-10-11-us-restores-uk-aisi-pre-release-model-access","url":"https://postcutoff.com/e/2026-10-11-us-restores-uk-aisi-pre-release-model-access/","date":"2026-10-11","date_precision":"day","short_title":"Telegraph: White House reverses course and lets US labs again give the UK AI Security Institute pre-release access to new models","deck":null,"takeaway":"Pre-release testing by the UK institute was one of the few working international safety checks on frontier models, and its suspension in September was read as the US treating those models as national assets.","category":"policy-safety","category_label":"Policy & safety","importance":4,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":4,"official":0,"filed":"2026-10-12","updated":"2026-10-12","orgs":["White House","UK AI Security Institute","UK Government","OpenAI","Anthropic","Google DeepMind"]},{"id":"2026-09-22-trump-unga-rejects-global-ai-control","url":"https://postcutoff.com/e/2026-09-22-trump-unga-rejects-global-ai-control/","date":"2026-09-22","date_precision":"day","short_title":"Trump at the UN General Assembly 'totally rejects' any global scheme to control AI and renames it 'super intelligence'","deck":null,"takeaway":"It frames the split of Sept 2026: labs and much of the world asking for international machinery, and the US government refusing it.","category":"policy-safety","category_label":"Policy & safety","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":8,"official":1,"filed":"2026-09-29","updated":"2026-10-07","orgs":["White House","United Nations"]},{"id":"2026-09-01-claude-fable-5-1-mythos-5-1","url":"https://postcutoff.com/e/2026-09-01-claude-fable-5-1-mythos-5-1/","date":"2026-09-01","date_precision":"day","short_title":"Anthropic releases Claude Fable 5.1 and Claude Mythos 5.1","deck":null,"takeaway":"Fable/Mythos 5.1 was Anthropic's capability frontier until Opus 5.5 matched it three weeks later at less than half the price.","category":"model-release","category_label":"Model releases","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":9,"official":5,"filed":"2026-09-29","updated":"2026-10-19","orgs":["Anthropic"]},{"id":"2026-06-25-us-government-gates-gpt-5-6-release","url":"https://postcutoff.com/e/2026-06-25-us-government-gates-gpt-5-6-release/","date":"2026-06-25","date_precision":"day","short_title":"US government asks OpenAI to limit GPT-5.6 release to approved partners","deck":null,"takeaway":"The first time a US frontier-model release was explicitly gated by federal review — a de facto pre-deployment approval regime driven by cyber-offense concerns, arriving without new legislation.","category":"policy-safety","category_label":"Policy & safety","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":5,"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["OpenAI","US Government"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-10-12","type":"edit","text":"Added the reported reversal of Oct 11 (Telegraph via Reuters) and a link to its entry"},{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-10-12","human_review":null,"version":{"date":"2026-10-12"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":147,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":86,"in_training_data":false},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":177,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":116,"in_training_data":false}],"short_url":"https://postcutoff.com/s/white-house-asks-openai"}