# NetEase Youdao Open-Sources TTS Speech Synthesis Engine Confucius4-TTS

- Category: Flash (快讯)
- Published: 2026-06-25T11:52:00.000Z
- Source date: 2026-06-25
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NetEase Youdao has officially open-sourced the Confucius4-TTS speech synthesis model. The model achieves breakthroughs in zero-shot cloning, multi-language accent-free synthesis, and emotion transfer, utilizing an end-to-end architecture that supports local offline deployment.

## At a glance

- Supports 3-second zero-shot cloning and accent-free synthesis in 14 languages
- Uses an end-to-end architecture with 54GB weights for local offline deployment

## The update

The newly open-sourced Confucius4-TTS model from NetEase Youdao achieves three core breakthroughs in speech synthesis technology. First, it features robust zero-shot voice cloning, capable of replicating a voice with just three seconds of audio. Second, it supports cross-language synthesis in 14 languages while maintaining a natural, accent-free sound. Additionally, the model can accurately transfer emotion and prosody. Architecturally, it integrates a speech encoder, a large language model, and flow matching generation to build an efficient end-to-end system. With a full weight size of 54GB, it fully supports local offline deployment, meeting the needs of applications requiring high data privacy and low latency.

## Sources

- [网易有道](https://mp.weixin.qq.com/s/RxVQN3xpMpZSDexAqNXZNg) (2026-06-25)

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