Anthropic denies UK AI Security Institute pre-release access to Mythos 5.1, a first
ccerrato147 · x · 2026-09-21
Per the FT (Sep 9), Anthropic declined to give the UK AI Security Institute pre-release access to Mythos 5.1 — the first time a major model has been withheld from the institute before launch. Access remains limited to vetted US organisations, with no public reason given. The author notes a former UK PM advises Anthropic and the author of Britain's AI plan joined this month, yet Britain still can't get the model, questioning Dario's push for government oversight.
Related event: Anthropic denies UK AI Safety Institute pre-release access to new model(3 posts)→
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