Xiaomi MiMo-V2-TTS - Xiaomi's Large-Scale Speech Synthesis Model

Xiaomi MiMo-V2-TTS is launched by Xiaomi for the Agent era speech synthesisLarge model. The model is based on the self-developed Audio Tokenizer and multi-codebook architecture. After hundreds of millions of hours of voice data pre-training and multi-dimensional reinforcement learning, it achieves highly controllable multi-granularity voice style control - from the overall tone to local emotions, it can be accurately adjusted, supporting tone transitions and emotional gradients. The model has strong text understanding capabilities and can intelligently identify punctuation and modal particles; the model also supports dialects, role-playing and singing voice synthesis, allowing AI to “understand” and express naturally with warm and soulful voices.

Main features of Xiaomi MiMo-V2-TTS

• Multi-level voice style control : Supports precise adjustment from overall style setting to local emotional expression, and can complete tone transitions and emotional gradients in the same sentence.
• Intelligent text understanding : Automatically recognize punctuation marks, modal particles, emphasis marks and other format signals, and convert them into natural speech expressions without additional annotations.
• Dialect support : Supports natural pronunciation of various dialects such as Northeastern dialect, Sichuan dialect, Henan dialect, Cantonese, and Taiwanese accent.
• role play : The model can perform stylized character interpretations and imitate the tone of a specific character.
• Singing synthesis : Supports accurate expression of pitch and rhythm for natural and expressive singing.
• Hi-Fi Sound Cloning : The model can clone specific timbres and maintain high-quality output.

Technical principles of Xiaomi MiMo-V2-TTS

• Self-developed Audio Tokenizer : MiMo Audio Tokenizer is used to achieve efficient discretization of speech signals.
• Multi-codebook joint modeling architecture : Precisely model speech through multi-layer codebooks, fully retaining the rich information in the original speech.
• Very large-scale pre-training : Use hundreds of millions of hours of speech data for speech-text hybrid pre-training to acquire unified capabilities for cross-modal alignment and understanding generation.
• High-quality supervision and fine-tuning : Based on fine-tuning with a small amount of high-quality data, obtain generalizable multi-granularity and multi-style instruction control capabilities.
• Multi-dimensional reinforcement learning optimization : The model is continuously optimized around dimensions such as rhythm, voice quality, word expression, timbre cloning, and scene tone, and directly uses voice-related reward signals to improve the quality of generation.

Key information and usage requirements of Xiaomi MiMo-V2-TTS

• Model positioning : A large speech synthesis model specially designed for the Agent era, giving intelligent agents the ability to express warm and emotional voices.
• core architecture : Based on self-developed MiMo Audio Tokenizer and multi-codebook speech-text joint modeling architecture.
• Training data size : Hundreds of millions of hours of voice data.
• Technical route : Ultra-large-scale pre-training + high-quality supervised fine-tuning + multi-dimensional reinforcement learning post-training.
• Supported languages : Currently covering Chinese and English, with plans to expand to more languages in the future.
• Integration planning : Deeply integrated with MiMo-V2-Omni’s multi-modal understanding capabilities to create a full-modal Agent that can understand, understand, and speak.

Core advantages of Xiaomi MiMo-V2-TTS

• Full stack Agent native design : Specifically built for the Agent era, it forms a complete technical closed loop with the MiMo-V2 series models to achieve full-link capabilities from understanding to expression.
• Refined style control : Supports multi-level adjustment from the overall tone to local emotions. Tone transitions and emotional gradients can be achieved within the same sentence, and the control granularity is industry-leading.
• Very large-scale data training : Based on hundreds of millions of hours of pre-training on speech data, it covers a wide range of speaking styles and scenarios, and has strong generalization capabilities.
• End-to-end intelligent understanding : Automatically identify punctuation, modal particles, and emphasis marks in the text without additional annotations, and intelligently convert them into natural speech expressions.
• Multi-dimensional reinforcement learning optimization : Directly optimize through multi-dimensional reward signals such as rhythm, sound quality, word expression, timbre cloning, scene tone and so on, taking into account both stability and expressiveness.

How to use Xiaomi MiMo-V2-TTS

It is planned to be deeply integrated with MiMo-V2-Omni multi-modal capabilities in the future.

Comparison of similar competing products of Xiaomi MiMo-V2-TTS

Contrast Dimensions	Xiaomi MiMo-V2-TTS	OpenAI GPT-4o Voice	ElevenLabs
core positioning	Full-stack speech synthesis designed for the Agent era	Native speech capabilities of multi-modal large models	Professional-grade AI speech synthesis platform
Architectural features	Self-developed Audio Tokenizer + multi-codebook joint modeling	End-to-end multi-modal unified architecture	Speech cloning and synthesis based on deep learning
style control	Multi-level (whole + part), supporting emotional gradation within the sentence	Natural conversation style, emotional expression is more natural	Supports style adjustment, but the granularity is relatively coarse
Pre-training data	Hundreds of millions of hours of voice data	Undisclosed specific data size	Undisclosed specific data size
Optimization method	Multi-dimensional reinforcement learning (rhythm/voice quality/words/tone color/scene)	End-to-end optimization, details not disclosed	Continuous optimization based on user feedback
Dialect support	Northeastern dialect, Sichuan dialect, Henan dialect, Cantonese, Taiwanese accent, etc.	Mainly supports mainstream languages, with limited dialect capabilities	Depends on training data, weak Chinese dialect support
role play	Support stylized role interpretation	Support multi-role dialogue	Supports voice cloning, role playing requires additional configuration
Singing synthesis	Native support	Not supported	Not supported
Integrate with Agent	Deep integration with MiMo-V2-Omni, native Agent design	Combined with GPT-4o multi-modal capabilities	Requires integration through API, non-native Agent design

Application scenarios of Xiaomi MiMo-V2-TTS

• Intelligent Assistant Voice Interaction : Give the AI Agent a natural and emotional voice, achieving a leap from “clearly audible” to “vital”, making the conversation between the machine and the machine more warm.
• Multi-role content creation : Use role-playing capabilities to generate stylized character voices for audiobooks, podcasts, game dubbing and other scenarios, reducing professional dubbing costs.
• Real-time emotional companionship : Through fine-grained emotion regulation, it provides situation-appropriate voice feedback in scenarios such as psychological counseling, online education, and virtual companionship.
• Cross-dialect service coverage : With multi-dialect support, it provides a natural and friendly dialect interactive experience for localized customer service, smart home control, aging-friendly applications, etc.
• creative entertainment production : Use singing voice synthesis capabilities to assist in the production of entertainment content such as music creation, virtual idol performances, and personalized ringtone production. ©