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What is Mu?

On June 23, 2025, Microsoft introduced Mu, a cutting-edge language model boasting 330 million parameters and designed to significantly improve the agent experience in Windows environments by seamlessly converting natural language questions into functional calls for Settings, with all operations executed on-device via NPUs at an impressive speed exceeding 100 tokens per second while maintaining high accuracy. Utilizing Phi Silica optimizations, Mu's encoder-decoder architecture employs a fixed-length latent representation that notably minimizes computational requirements and memory consumption, achieving a 47 percent decrease in first-token latency and delivering a decoding speed that is 4.7 times faster on Qualcomm Hexagon NPUs in comparison to traditional decoder-only models. Furthermore, the model is enhanced by hardware-aware tuning methodologies, which incorporate a strategic 2/3–1/3 division of encoder and decoder parameters, shared weights for both input and output embeddings, Dual LayerNorm, rotary positional embeddings, and grouped-query attention, facilitating rapid inference rates that surpass 200 tokens per second on devices like the Surface Laptop 7, along with response times for settings-related queries that are under 500 ms. This impressive blend of features and optimizations establishes Mu as a revolutionary development in the realm of on-device language processing capabilities, setting new standards for speed and efficiency. As a result, users can expect a more intuitive and responsive experience when interacting with their Windows settings through natural language.

What is Aion 1.0 Instruct?

Aion-1.0-Instruct is a recently launched compact language model incorporated into Microsoft Edge as part of a developer preview, which focuses on early testing and collecting user feedback. This innovative model is tailored to improve Edge's on-device Prompt and Writing Assistance APIs, offering web developers a faster, smaller, and more efficient AI-driven solution for browser features. Previously, Microsoft had employed Phi-4-mini for these APIs; however, its high hardware demands limited accessibility across various devices. In contrast, Aion-1.0-Instruct expands compatibility to a significantly wider range of devices, including those with less capable GPUs and even those that operate solely on CPU inference without a GPU, all while preserving excellent performance in various web applications. Developers can access this model through the Edge Canary and Dev channels, allowing them to evaluate its performance in real-world web settings, examine API interoperability, and provide feedback before final modifications. By enabling developers to effortlessly add AI capabilities to their websites and browser extensions, Aion-1.0-Instruct aims to enrich user experiences significantly. Moreover, its introduction could potentially revolutionize web development, making AI features more accessible and user-friendly for a larger audience. As the landscape of web technologies continues to evolve, the implications of this model will likely extend far beyond initial expectations.

Media

Media

Integrations Supported

JavaScript
Microsoft Edge

Integrations Supported

JavaScript
Microsoft Edge

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Microsoft

Date Founded

1975

Company Location

United States

Company Website

blogs.windows.com/windowsexperience/2025/06/23/introducing-mu-language-model-and-how-it-enabled-the-agent-in-windows-settings/

Company Facts

Organization Name

Microsoft

Date Founded

1975

Company Location

United States

Company Website

blogs.windows.com/msedgedev/2026/06/02/expanding-on-device-ai-in-microsoft-edge-new-models-and-apis-for-the-web/

Categories and Features

Categories and Features

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