OpenBMB · Tokenizer-Free TTS

VoxCPM2

Tokenizer-free TTS: an end-to-end diffusion-autoregressive architecture generating continuous speech representations directly rather than predicting discrete audio tokens. 2B parameters trained on over 2 million hours, covering 30 languages plus nine Chinese dialects at 48kHz, with voice design from a text description, controllable cloning with style guidance, and streaming down to roughly 0.3 RTF on a 4090. Reports 1.84% WER and 75.3% similarity on English Seed-TTS-eval, 0.97% CER on the hard sets and 1.68% average error across 30 languages. Apache-2.0, 36.7k stars.