Nothing to download or buy; it simply powers the settings agent on Copilot+ PCs, so it matters only to owners of those machines.
Kenning's take
What it does
Mu is a 330 million parameter on-device language model from Microsoft, built to run entirely on the neural processing unit of Copilot+ PCs at over 100 tokens per second. It powers the agent in Windows Settings, which turns a plain-language request into the matching settings change. It is built into Windows rather than offered as a download or API, and first reached Windows Insiders in the Dev Channel.
- 330M parameter encoder-decoder model
- Runs fully on the NPU of Copilot+ PCs
- Over 100 tokens per second on device
- Maps natural-language requests to Windows Settings actions
Who it suits. Owners of Copilot+ PCs who use the agent in Windows Settings.
Key facts
- Category
- AI models
- Part of
- Microsoft Copilot
- Made by
- Microsoft
- Released
- 23 June 2025
- How to get it
- built into the agent in Windows Settings on Copilot+ PCs; announced for Windows Insiders in the Dev Channel; no public weights or API
- Works on
- Windows (Copilot+ PCs)
- Free plan
- included in Windows on Copilot+ PCs
FAQ
What is Microsoft Mu?
A small on-device language model that powers the agent in Windows Settings on Copilot+ PCs.
Can I download Mu?
The announcement offers no download or API; Mu ships inside Windows on Copilot+ PCs.
When was Mu announced?
Microsoft introduced Mu on 23 June 2025.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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