Microsoft to enable Claude by default for UK Copilot customers

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Published Wednesday, November 11, 2026 · 3:36 PM EST

Microsoft will enable Anthropic's Claude models by default for UK Copilot customers from 9 December, The Register reported. Organisations that leave the setting unchanged will be opted in; administrators can still disable it. Anthropic processes the data in the US. The change covers Copilot, Researcher, Copilot Studio, Power Platform and Copilot in Microsoft 365 apps. Microsoft is also retiring a setting that restricted Claude to Microsoft 365 apps. Its documentation excludes Claude from in-country processing commitments. Advanced models including Claude Fable 5 and Claude Mythos 5 will remain off by default and require separate administrator approval because Anthropic retains their data, mostly for up to 30 days.

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