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    <img src="assets/kimia_logo.png" width="400"/>
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Kimi-Audio-7B  <a href="https://huggingface.co/moonshotai/Kimi-Audio-7B">🤗</a>&nbsp; ｜ Kimi-Audio-7B-Instruct <a href="https://huggingface.co/moonshotai/Kimi-Audio-7B-Instruct">🤗</a>&nbsp; | 📑 <a href="assets/kimia_report.pdf">Paper</a> &nbsp;&nbsp;
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We present Kimi-Audio, an open-source audio foundation model excelling in **audio understanding, generation, and conversation**. This repository contains the official implementation, pre-trained models, and evaluation toolkit for Kimi-Audio.

## 🔥🔥🔥 News!!
* April 25, 2025: 👋 We release the inference code and model weights of [Kimi-Audio-7B](https://huggingface.co/moonshotai/Kimi-Audio-7B) and [Kimi-Audio-7B-Instruct](https://huggingface.co/moonshotai/Kimi-Audio-7B-Instruct).
* April 25, 2025: 👋 We release the audio evaluation toolkit [ALMEvalKit](https://github.com/moonshotai/KimiA-Audio-EvaluationToolkit). We can easily reproduce the **our results and baselines** by this toolkit!
* April 25, 2025: 👋 We release the technical report of [Kimi-Audio](assets/kimia_report.pdf).

## Table of Contents

- [Introduction](#introduction)
- [Architecture Overview](#architecture-overview)
- [License](#license)
- [Acknowledgements](#acknowledgements)
- [Citation](#citation)
- [Contact Us](#contact-us)

## Introduction

Kimi-Audio is designed as a universal audio foundation model capable of handling a wide variety of audio processing tasks within a single unified framework. Key features include:

*   **Universal Capabilities:** Handles diverse tasks like speech recognition (ASR), audio question answering (AQA), audio captioning (AAC), speech emotion recognition (SER), sound event/scene classification (SEC/ASC), text-to-speech (TTS), voice conversion (VC), and end-to-end speech conversation.
*   **State-of-the-Art Performance:** Achieves SOTA results on numerous audio benchmarks (see [Technical Report](assets/kimia_report.pdf)).
*   **Large-Scale Pre-training:** Pre-trained on over 13 million hours of diverse audio data (speech, music, sounds) and text data, enabling robust audio reasoning and language understanding.
*   **Novel Architecture:** Employs a hybrid audio input (continuous acoustic + discrete semantic tokens) and an LLM core with parallel heads for text and audio token generation.
*   **Efficient Inference:** Features a chunk-wise streaming detokenizer based on flow matching for low-latency audio generation.
*   **Open-Source:** We release the code, model checkpoints, and a comprehensive evaluation toolkit to foster community research and development.

**This is the pre-trained model of Kimi-Audio. If you want to use Kimi-Audio in practice, please refer to [Kimi-Audio-7B-Instruct](https://huggingface.co/moonshotai/Kimi-Audio-7B-Instruct).**


## Architecture Overview

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    <img src="assets/kimia_framework.png" width="70%"/>
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Kimi-Audio consists of three main components:

1.  **Audio Tokenizer:** Converts input audio into:
    *   Discrete semantic tokens (12.5Hz) using vector quantization.
    *   Continuous acoustic features derived from a Whisper encoder (downsampled to 12.5Hz).
2.  **Audio LLM:** A transformer-based model (initialized from a pre-trained text LLM like Qwen 2.5 7B) with shared layers processing multimodal inputs, followed by parallel heads for autoregressively generating text tokens and discrete audio semantic tokens.
3.  **Audio Detokenizer:** Converts the predicted discrete semantic audio tokens back into high-fidelity waveforms using a flow-matching model and a vocoder (BigVGAN), supporting chunk-wise streaming with a look-ahead mechanism for low latency.


## License

The model is based and modified from [Qwen 2.5-7B](https://github.com/QwenLM/Qwen2.5). Code derived from Qwen2.5-7B is licensed under the [Apache 2.0 License](https://www.apache.org/licenses/LICENSE-2.0). Other parts of the code are licensed under the [MIT License](https://opensource.org/licenses/MIT).


## Acknowledgements

We would like to thank the following projects and individuals for their contributions to the development of Kimi-Audio:

* [Whisper](https://github.com/openai/whisper)
* [Transformers](https://github.com/huggingface/transformers)
* [BigVGAN](https://github.com/NVIDIA/BigVGAN)
* [GLM-4-Voice](https://github.com/THUDM/GLM-4-Voice)

Thank you to all the open-source projects for their contributions to this project!


## Citation

If you find Kimi-Audio useful in your research or applications, please cite our technical report:

```bibtex
@misc{kimi_audio_2024,
      title={Kimi-Audio Technical Report},
      author={Kimi Team},
      year={2024},
      eprint={arXiv:placeholder},
      archivePrefix={arXiv},
      primaryClass={cs.CL}
}
```

## Contact Us

For questions, issues, or collaboration inquiries, please feel free to open an issue on GitHub.