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README.md
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# MiMo-V2.5-ASR-MLX-8bit
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Current variant: `8bit`
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## Introduction
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**MiMo-V2.5-ASR** is
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- Native support for
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- Seamless Chinese-English code-switching transcription
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- Robust recognition under heavy noise
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- Accurate transcription
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- Native
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## Results
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- Official blog: `mimo.xiaomi.com/mimo-v2-5-asr`
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| Variant | Precision | Size | Local smoke time | Smoke result |
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| `MiMo-V2.5-ASR-MLX-bf16` | bf16 | 15 GB | - | dense reference export |
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| `MiMo-V2.5-ASR-MLX-fp32` | fp32 | 30 GB | - | dense reference export |
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## Validation
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Local smoke validation was run with `mlx-audio-swift` on `Tests/media/intention.wav`.
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- Output: `Intention.`
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##
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```bibtex
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@misc{coreteam2026mimov25asr,
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## Contact
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- `mimo@xiaomi.com`
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- `XiaomiMiMo/MiMo-V2.5-ASR`
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- en
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---
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Current variant: `8bit`
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<div align="center">
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<img src="https://raw.githubusercontent.com/XiaomiMiMo/MiMo-V2.5-ASR/main/assets/XiaomiMIMO.png" width="60%" alt="Xiaomi-MiMo" />
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</div>
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<div align="center">
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<h3>
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<b>
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<span>βββββββββββββββββββββββββββββββ</span><br/>
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MiMo-V2.5-ASR: Robust Speech Recognition Across<br/>
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Languages, Dialects, and Complex Acoustic Scenarios<br/>
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<span>βββββββββββββββββββββββββββββββ</span>
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</b>
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</h3>
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</div>
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<br/>
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<div align="center" style="line-height: 1;">
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<a href="https://huggingface.co/XiaomiMiMo/MiMo-V2.5-ASR" target="_blank">π€ Official Model</a>
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<a href="https://huggingface.co/spaces/XiaomiMiMo/MiMo-V2.5-ASR" target="_blank">π Official Demo</a>
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<a href="https://mimo.xiaomi.com/mimo-v2-5-asr" target="_blank">π° Official Blog</a>
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<a href="https://github.com/XiaomiMiMo/MiMo-V2.5-ASR" target="_blank">π» Official Code</a>
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</div>
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<br/>
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## MLX Note
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This repository is a community MLX conversion of the official `XiaomiMiMo/MiMo-V2.5-ASR` release for Apple silicon. The original model description below is preserved from the official release, and the MLX-specific material in this page is added as an incremental note for local MLX deployment.
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## Introduction
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**MiMo-V2.5-ASR** is a state-of-the-art end-to-end automatic speech recognition (ASR) model developed by the Xiaomi MiMo team. It is built to deliver accurate and robust transcription across Mandarin Chinese and English, multiple Chinese dialects, code-switched speech, song lyrics, knowledge-intensive content, noisy acoustic environments, and multi-speaker conversations. MiMo-V2.5-ASR achieves state-of-the-art results on a wide range of public benchmarks.
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## Abstract
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Automatic speech recognition systems are expected to faithfully transcribe speech signals that originate from diverse languages, dialects, accents, and domains, and that are captured under a wide variety of acoustic conditions. While conventional end-to-end models perform well on in-domain data, they still fall short of real-world requirements in challenging scenarios such as dialect mixing, code-switching, knowledge-intensive content, noisy environments, and multi-speaker conversations. Therefore, we present **MiMo-V2.5-ASR**, an end-to-end speech recognition model developed by the Xiaomi MiMo team. Through large-scale mid-training, high-quality supervised fine-tuning, and a novel reinforcement-learning algorithm, MiMo-V2.5-ASR achieves systematic improvements along the following dimensions:
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- π£οΈ **Chinese Dialects**: Native support for Wu, Cantonese, Hokkien, Sichuanese, and more.
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- π **Code-Switch**: Seamless Chinese-English code-switching transcription with no language tags required.
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- π΅ **Song Recognition**: High-precision lyrics transcription for Chinese and English songs, even with mixed accompaniment and vocals.
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- π **Noisy Environments**: Robust recognition under heavy noise, far-field capture, and other adverse acoustic conditions.
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- π₯ **Multi-Speaker**: Accurate transcription of overlapping, multi-party conversations such as meetings.
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- π¬π§ **Complex English Scenarios**: Leading performance on the Open ASR Leaderboard for challenging English benchmarks such as AMI.
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- π **Knowledge-Intensive Recognition**: Precise recognition of classical poetry, technical terminology, personal names, place names, and other knowledge-dense material.
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- π **Native Punctuation**: Punctuation generated natively from prosody and semantics, delivering ready-to-use transcripts with no post-processing needed.
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## Results
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MiMo-V2.5-ASR has been evaluated across a broad set of benchmarks spanning standard Mandarin and English, Chinese dialects, lyric recognition, and internal business scenarios. The chart below summarizes the average performance of MiMo-V2.5-ASR across these scenarios.
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For per-benchmark numbers and specific qualitative cases, please refer to the official [blog](https://mimo.xiaomi.com/mimo-v2-5-asr).
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## Model Download
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| Models | π€ Hugging Face |
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|-------|-------|
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| MiMo-Audio-Tokenizer | [XiaomiMiMo/MiMo-Audio-Tokenizer](https://huggingface.co/XiaomiMiMo/MiMo-Audio-Tokenizer) |
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| MiMo-V2.5-ASR | [XiaomiMiMo/MiMo-V2.5-ASR](https://huggingface.co/XiaomiMiMo/MiMo-V2.5-ASR) |
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```bash
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pip install huggingface-hub
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hf download XiaomiMiMo/MiMo-Audio-Tokenizer --local-dir ./models/MiMo-Audio-Tokenizer
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hf download XiaomiMiMo/MiMo-V2.5-ASR --local-dir ./models/MiMo-V2.5-ASR
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```
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## MLX Releases
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The following repositories are MLX conversions derived from the official release:
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| Variant | Precision | Size | Local smoke time | Smoke result |
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| --- | --- | ---: | ---: | --- |
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| `MiMo-V2.5-ASR-MLX-bf16` | bf16 | 15 GB | - | dense reference export |
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| `MiMo-V2.5-ASR-MLX-fp32` | fp32 | 30 GB | - | dense reference export |
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MLX conversion notes:
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- Base model: `XiaomiMiMo/MiMo-V2.5-ASR`
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- Required tokenizer: `XiaomiMiMo/MiMo-Audio-Tokenizer`
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- Conversion date: `2026-05-12`
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- Local validation runtime: `mlx-audio-swift`
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- Recommended default: `MiMo-V2.5-ASR-MLX`
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Example downloads:
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```bash
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hf download ailuntz/MiMo-V2.5-ASR-MLX --local-dir ./models/MiMo-V2.5-ASR-MLX
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hf download ailuntz/MiMo-V2.5-ASR-MLX-8bit --local-dir ./models/MiMo-V2.5-ASR-MLX-8bit
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```
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## Validation
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Local smoke validation was run with `mlx-audio-swift` on `Tests/media/intention.wav`.
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- Output: `Intention.`
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## Getting Started
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The following section is preserved from the official project and describes the original Python/CUDA workflow.
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Spin up the MiMo-V2.5-ASR demo in minutes with the built-in Gradio app.
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### Prerequisites (Linux)
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* Python 3.12
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* CUDA >= 12.0
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### Installation
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```bash
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git clone https://github.com/XiaomiMiMo/MiMo-V2.5-ASR.git
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cd MiMo-V2.5-ASR
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pip install -r requirements.txt
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pip install flash-attn==2.7.4.post1
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```
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> [!Note]
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> If the compilation of flash-attn takes too long, you can download the precompiled wheel and install it manually:
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> * [Download Precompiled Wheel](https://github.com/Dao-AILab/flash-attention/releases/download/v2.7.4.post1/flash_attn-2.7.4.post1+cu12torch2.6cxx11abiFALSE-cp312-cp312-linux_x86_64.whl)
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> ```sh
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> pip install /path/to/flash_attn-2.7.4.post1+cu12torch2.6cxx11abiFALSE-cp312-cp312-linux_x86_64.whl
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> ```
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### Run the Demo
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```bash
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python run_mimo_asr.py
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```
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This launches a local Gradio interface for MiMo-V2.5-ASR. You can:
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* Upload an audio file **or** record directly from your microphone.
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* Optionally specify a **language tag** (Chinese / English / Auto) to bias the model for a specific language, or leave it to **Auto** for automatic language detection (recommended for code-switched speech).
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* The demo calls the `asr_sft()` interface under the hood.
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To load the model and tokenizer automatically at startup, pass their paths on the command line:
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```bash
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python run_mimo_asr.py \
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--model-path ./models/MiMo-V2.5-ASR \
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--tokenizer-path ./models/MiMo-Audio-Tokenizer
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```
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Otherwise, enter the local paths for `MiMo-Audio-Tokenizer` and `MiMo-V2.5-ASR` in the **Model Configuration** tab, then start transcribing.
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## Python API
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The following API example is preserved from the official project.
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Basic usage with the `asr_sft` interface:
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```python
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from src.mimo_audio.mimo_audio import MimoAudio
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model = MimoAudio(
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model_path="./models/MiMo-V2.5-ASR",
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tokenizer_path="./models/MiMo-Audio-Tokenizer",
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)
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# Automatic language detection (recommended for code-switching)
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text = model.asr_sft("path/to/audio.wav")
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print(text)
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# With explicit language tag
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text_zh = model.asr_sft("path/to/audio.wav", audio_tag="<chinese>")
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text_en = model.asr_sft("path/to/audio.wav", audio_tag="<english>")
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```
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## Citation
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```bibtex
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@misc{coreteam2026mimov25asr,
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## Contact
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Please contact [mimo@xiaomi.com](mailto:mimo@xiaomi.com) or open an issue in the official project if you have questions about the original model.
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