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AI · June 24, 2025

Mu

Fast, local AI comes to Windows Copilot+ PCs

Mu launched on June 24, 2025 with 126 votes, #333 of 7,999 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.

What it does

Mu by Microsoft is a new ~330M on-device SLM that runs on the NPU in Copilot+ PCs. It powers the new agent in Windows Settings, delivering high speed and efficiency for local AI tasks.

We are excited to introduce our newest on-device small language model, Mu. This model addresses scenarios that require inferring complex input-output relationships and has been designed to operate efficiently, delivering high performance while runnin

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