MAI-Voice-2.1-Flash

MAI-Voice-2.1-Flash is a prompted text-to-speech (TTS) model built in-house by the Microsoft AI team for fast, low-latency generation. It delivers high-fidelity, natural, and expressive speech across 23 languages while being optimized for real-time responsiveness, preserving human-like intonation, rhythm, and emotional nuance. Developers can control tone, emotion, and delivery through SSML, making it ideal for voice agents, call center agents, assistants, and other interactive scenarios where speed is critical.

Voice can be configured using:

• Curated voice library (licensed voices designed to work straight out of the box)
• Voice Cloning via short audio clips (5-60 seconds), and the model matches the voice instantly

• Natural and expressive voice synthesis with realistic intonation, rhythm, and emotional range.
• Low latency optimized for real-time use cases like voice assistants and call center agents.
• High-fidelity, high-clarity voice output.
• Multilingual support across 23 languages.
• One voice across all supported languages: a single voice identity is rendered consistently in every supported language.
• Fine-grained control of tone and delivery: shape emotion, tone, and delivery at the turn/sentence level, including different speaking styles via SSML.
• Streaming output, enabling barge-in and interruption handling for live dialogue.
• State-of-the-art instant Voice Cloning: provide a short audio clip (5-60 seconds) and the model clones the voice instantly, with no fine-tuning required. Prompt quality significantly impacts output, with best results from natural, conversational delivery and moderate energy levels. Access requires Microsoft approval and guardrails are in place to avoid misuse.
• Multi-speaker support for dialogue and conversational scenarios.