---
license: apache-2.0
pipeline_tag: text-to-speech
tags:
- text-to-speech
- voice-cloning
- tokenizer-free
- diffusion-autoregressive
- minicpm
- multilingual
- openbmb
- mirror
---

# VoxCPM2 — inference mirror for MAESTRO

Inference-ready repack of
[openbmb/VoxCPM2](https://huggingface.co/openbmb/VoxCPM2) (OpenBMB), kept by
AEmotionStudio so the MAESTRO DAW can fetch the checkpoint on demand. The
model is **not** fine-tuned or otherwise altered — this repo only repacks
the upstream weights for loading:

* `model.safetensors` — the 2B tokenizer-free diffusion-AR stack
  (LocEnc → MiniCPM-4 TSLM → RALM → LocDiT), verbatim from upstream
  (bf16 storage, sha256-checked; bf16 confirmed by MAESTRO's same-seed
  fp16-vs-bf16 whisper-gate against a seed-to-seed null baseline).
* `audiovae.safetensors` — AudioVAE V2 (16 kHz encode → 48 kHz decode),
  converted from the pickled `audiovae.pth` via `safetensors.save_model`
  (the VAE uses `weight_norm`, whose `weight_g`/`weight_v` aliasing a bare
  `save_file` would corrupt).
* `config.json`, `tokenizer.json`, `special_tokens_map.json` — verbatim.
* `tokenizer_config.json` — verbatim minus the list-form
  `extra_special_tokens` key (crashes some transformers loaders; the
  tokens are already registered in `tokenizer.json`, so dropping the key
  is lossless).
* upstream's `tokenization_voxcpm2.py` is **omitted** — inference loads a
  plain `LlamaTokenizerFast`; no `trust_remote_code` anywhere.
* `sha256.json` — checksums of every file in this repo.

| Component | Purpose |
|---|---|
| `model.safetensors` | LocEnc + MiniCPM-4 2B TSLM + RALM + LocDiT |
| `audiovae.safetensors` | AudioVAE V2 (latents → 48 kHz mono waveform) |
| tokenizer files | LlamaTokenizerFast vocabulary + config |

VoxCPM2 is a **tokenizer-free diffusion-autoregressive TTS** at native
48 kHz: 30 languages plus 9 Chinese dialects with no language tags, voice
design from a text description, and three cloning tiers (reference clip /
reference + style directive / reference + transcript).

## License

* **Code**: Apache-2.0 ([OpenBMB/VoxCPM](https://github.com/OpenBMB/VoxCPM)).
* **Weights (this repo): Apache-2.0** — inherited unchanged from upstream.

Credit for the model belongs entirely to the OpenBMB team; this mirror
exists only for reliable on-demand delivery into MAESTRO.