Microsoft announces its first in-house voice generation AI 'MAI-Voice-1 AI' and the base model 'MAI-1-preview'
Microsoft's AI division develops 'MAI,' an AI model designed, built, and trained in-house. On August 28, 2025, Microsoft announced the first voice model in the MAI family, ' MAI-Voice-1 AI ,' and its foundation model, ' MAI-1-preview .'
Two in-house models in support of our mission | Microsoft AI
MAI-Voice-1 AI is an AI model that can generate expressive, natural-sounding voices. It can be used in some features of Microsoft's AI assistant, Copilot, such as Copilot Daily, which summarizes and reads news and weather, and generates podcast-style discussions.
MAI-Voice-1 AI is available for free trial through Copilot Labs , where you can try out new features and functionality from Copilot.
In Copilot Labs' 'Copilot Audio Expressions,' you first choose the mode from 'Emotion' and 'Story.' In 'Emotion,' you choose the tone of voice and emotion from a selection of options, and in 'Story' mode, you specify everything using prompts alone.
In 'Audio,' you can choose the tone and atmosphere of the voice used to read the text, as well as whether the accent is British or American.
In 'Style,' you can select the emotion of the voice, such as 'Joy' or 'Sadness.'
Once you have entered the text, click 'Generate'.
About 30 seconds of audio was generated. Rather than reading the input text aloud, it creates a short speech based on the text.
MAI-1-preview is a Microsoft Mixed-of-Experts (MoE) model that has been pre-trained and post-trained on approximately 15,000 NVIDIA H100 GPUs and has been published for testing on LMArena , a public web -based platform for large-scale language models (LLMs) .
According to Microsoft, MAI-1-preview is designed to provide powerful capabilities to consumers who want a model that specializes in providing helpful answers to everyday questions and instructions. MAI-1-preview will be rolled out over the next few weeks to text use cases within Copilot, allowing for user feedback and refinement.
In a blog post, Microsoft AI said, 'We have big ambitions for our next steps. We believe that not only will we pursue further advancements in the field of AI, but we can also create immense value by integrating purpose-built models that address a variety of user intents and use cases. In the near future, Microsoft's AI team will produce even more results in both AI and machine learning. We aim to bring cutting-edge models to people all over the world, and we look forward to our future efforts.'
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