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YODAS v3: Over 1 Million Hours of High-Bandwidth, Stereophonic, Multilingual Speech

arXiv cs.CL Multimodal & Generative William Chen, Shinnosuke Takamichi, Sayaka Shiota, Satoru Fukayama, Samuele Cornell, Shinji Watanabe 2026-09-24

TL;DR - YODAS v3 is an open, weakly labeled speech corpus containing over 1.1 million hours of 48kHz multichannel audio across 147 languages. Its unprecedented scale, language coverage, and stereo fidelity could support research in multilingual speech recognition and neural audio codecs.

Released under CC BY 3.0 and described as the largest open speech dataset to date.
Introduces collection techniques designed to gather more language-balanced speech data.
Includes over 10,000 hours for 22 languages and over 5,000 hours for 73 languages.
Provides analyses of language coverage, audio quality, and transcription quality, plus baseline speech-recognition and neural-codec models.

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