VoxCPM 1.0¶
Release Date: September 16, 2025
Parameter Size: 600M
Sampling Rate: 16kHz
Note
VoxCPM 1.0 is a legacy baseline release kept for compatibility and historical reference.
Overview¶
VoxCPM is a novel tokenizer-free Text-to-Speech (TTS) system that redefines realism in speech synthesis. By modeling speech in a continuous space, it overcomes the limitations of discrete tokenization and enables two flagship capabilities: context-aware speech generation and true-to-life zero-shot voice cloning.
Unlike mainstream approaches that convert speech to discrete tokens, VoxCPM uses an end-to-end diffusion autoregressive architecture that directly generates continuous speech representations from text. Built on MiniCPM-4 backbone, it achieves implicit semantic-acoustic decoupling through hierarchical language modeling and FSQ constraints, greatly enhancing both expressiveness and generation stability.
Architecture¶
Getting Started¶
For installation, loading, and the generic generate() workflow, start with Quick Start.
Use this checkpoint when you specifically want the original 0.5B VoxCPM release with 16kHz output.
Benchmarks¶
VoxCPM achieves competitive results on public zero-shot TTS benchmarks:
Seed-TTS-eval Benchmark¶
Model |
Parameters |
Open-Source |
test-EN |
test-ZH |
test-Hard |
|||
|---|---|---|---|---|---|---|---|---|
/ |
WER/%⬇ |
SIM/%⬆ |
CER/%⬇ |
SIM/%⬆ |
CER/%⬇ |
SIM/%⬆ |
||
MegaTTS3 |
0.5B |
❌ |
2.79 |
77.1 |
1.52 |
79.0 |
/ |
/ |
DiTAR |
0.6B |
❌ |
1.69 |
73.5 |
1.02 |
75.3 |
/ |
/ |
CosyVoice3 |
0.5B |
❌ |
2.02 |
71.8 |
1.16 |
78.0 |
6.08 |
75.8 |
CosyVoice3 |
1.5B |
❌ |
2.22 |
72.0 |
1.12 |
78.1 |
5.83 |
75.8 |
Seed-TTS |
/ |
❌ |
2.25 |
76.2 |
1.12 |
79.6 |
7.59 |
77.6 |
MiniMax-Speech |
/ |
❌ |
1.65 |
69.2 |
0.83 |
78.3 |
/ |
/ |
CosyVoice |
0.3B |
✅ |
4.29 |
60.9 |
3.63 |
72.3 |
11.75 |
70.9 |
CosyVoice2 |
0.5B |
✅ |
3.09 |
65.9 |
1.38 |
75.7 |
6.83 |
72.4 |
F5-TTS |
0.3B |
✅ |
2.00 |
67.0 |
1.53 |
76.0 |
8.67 |
71.3 |
SparkTTS |
0.5B |
✅ |
3.14 |
57.3 |
1.54 |
66.0 |
/ |
/ |
FireRedTTS |
0.5B |
✅ |
3.82 |
46.0 |
1.51 |
63.5 |
17.45 |
62.1 |
FireRedTTS-2 |
1.5B |
✅ |
1.95 |
66.5 |
1.14 |
73.6 |
/ |
/ |
Qwen2.5-Omni |
7B |
✅ |
2.72 |
63.2 |
1.70 |
75.2 |
7.97 |
74.7 |
OpenAudio-s1-mini |
0.5B |
✅ |
1.94 |
55.0 |
1.18 |
68.5 |
/ |
/ |
IndexTTS2 |
1.5B |
✅ |
2.23 |
70.6 |
1.03 |
76.5 |
/ |
/ |
VibeVoice |
1.5B |
✅ |
3.04 |
68.9 |
1.16 |
74.4 |
/ |
/ |
HiggsAudio-v2 |
3B |
✅ |
2.44 |
67.7 |
1.50 |
74.0 |
/ |
/ |
VoxCPM |
0.5B |
✅ |
1.85 |
72.9 |
0.93 |
77.2 |
8.87 |
73.0 |
CV3-eval Benchmark¶
Model |
zh |
en |
hard/zh |
hard/en |
||||
|---|---|---|---|---|---|---|---|---|
/ |
CER/%⬇ |
WER/%⬇ |
CER/%⬇ |
SIM/%⬆ |
DNSMOS⬆ |
WER/%⬇ |
SIM/%⬆ |
DNSMOS⬆ |
F5-TTS |
5.47 |
8.90 |
/ |
/ |
/ |
/ |
/ |
/ |
SparkTTS |
5.15 |
11.0 |
/ |
/ |
/ |
/ |
/ |
/ |
GPT-SoVits |
7.34 |
12.5 |
/ |
/ |
/ |
/ |
/ |
/ |
CosyVoice2 |
4.08 |
6.32 |
12.58 |
72.6 |
3.81 |
11.96 |
66.7 |
3.95 |
OpenAudio-s1-mini |
4.00 |
5.54 |
18.1 |
58.2 |
3.77 |
12.4 |
55.7 |
3.89 |
IndexTTS2 |
3.58 |
4.45 |
12.8 |
74.6 |
3.65 |
/ |
/ |
/ |
HiggsAudio-v2 |
9.54 |
7.89 |
41.0 |
60.2 |
3.39 |
10.3 |
61.8 |
3.68 |
CosyVoice3-0.5B |
3.89 |
5.24 |
14.15 |
78.6 |
3.75 |
9.04 |
75.9 |
3.92 |
CosyVoice3-1.5B |
3.91 |
4.99 |
9.77 |
78.5 |
3.79 |
10.55 |
76.1 |
3.95 |
VoxCPM |
3.40 |
4.04 |
12.9 |
66.1 |
3.59 |
7.89 |
64.3 |
3.74 |