Dissecting Youdao’s “Ziyue 4” Fully Open Source: How Can Reconstructing Chain-of-Thought Reduce Implementation Costs?

▤ Summary

NetEase Youdao announced the 4.0 upgrade of its 'Ziyue' large model family and open-sourced its core multimodal model and TTS engine. The multimodal model (27B) achieves industry-leading performance on visual math and Chinese text math tasks while reducing reasoning token output by 43.2%, lowering inference cost. The open-source TTS supports 14 languages, offers three-second voice cloning with high accuracy, and preserves speaker timbre and emotion across languages. Youdao also rebuilt its translation models with multi-expert OPD and reinforcement learning, improving translation quality and increasing inference speed by about 80%, aiming to make the stack easier for developers to adopt.

▦ Linked Companies

Youdao

$250M to $500M