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UK Microsoft Copilot tenants will get Claude access by default from December
Microsoft will enable access to Anthropic’s Claude models by default for UK Copilot tenants from 9 December. The change means organisations must review their settings if they do not want Claude available, particularly where US-based data processing may affect compliance requirements.
Anthropic acts as a Microsoft subprocessor, and its documentation says relevant data is processed in the United States. Claude is already enabled by default for most commercial cloud customers, while the UK, European Union and European Free Trade Association have been exceptions. Microsoft says it is also retiring a setting that limited Claude access to Microsoft 365 alone.
In short
- Claude access becomes default for UK Copilot tenants on 9 December.
- Administrators can disable access before the change takes effect.
- Anthropic processes the relevant data in the United States.
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Making Claude available by default gives UK organisations more choice of AI models and can improve Copilot’s usefulness without requiring each tenant to enable access manually. Microsoft may see a consistent default as simpler to manage, while organisations retain the ability to review their settings and restrict access where needed.
The case against
A default change can expose organisations to data-processing arrangements they have not actively chosen, especially when Anthropic processes relevant data in the United States. Requiring administrators to opt out shifts the burden onto them to identify and assess compliance implications in time, and retiring the Microsoft 365-only setting removes a control some organisations may rely on.
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Originally published by The Register as “Microsoft is giving Claude the keys to UK Copilot tenants by default”.