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Step-Audio-EditX

Name: Step-Audio-EditX
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Step-Audio-EditX

🔥🔥🔥 News!!！

Jan 23, 2026: 🌟 Training and inference for vLLM are now supported. Thanks to the vLLM team!
Jan 23, 2026: 💻 We release the GRPO training code.
Jan 23, 2026: 🧩 New Model Release: Now supporting more paralinguistic tags.
Nov 28, 2025: 🚀 New Model Release: Now supporting Japanese and Korean languages.
Nov 23, 2025: 📊 Step-Audio-Edit-Benchmark Released!
Nov 19, 2025: ⚙️ We release a new version of our model, which supports polyphonic pronunciation control and improves the performance of emotion, speaking style, and paralinguistic editing.
Nov 12, 2025: 📦 We release the optimized inference code and model weights of Step-Audio-EditX (HuggingFace; ModelScope) and Step-Audio-Tokenizer(HuggingFace; ModelScope)
Nov 07, 2025: ✨ Demo Page ; 🎮 HF Space Playground
Nov 06, 2025: 👋 We release the technical report of Step-Audio-EditX.

Introduction

We are open-sourcing Step-Audio-EditX, a powerful 3B-parameter LLM-based Reinforcement Learning audio model specialized in expressive and iterative audio editing. It excels at editing emotion, speaking style, and paralinguistics, and also features robust zero-shot text-to-speech (TTS) capabilities.

📑 Open-source Plan

Inference Code
Online demo (Gradio)
Step-Audio-Edit-Benchmark
Model Checkpoints
- Step-Audio-Tokenizer
- Step-Audio-EditX
- Step-Audio-EditX-Int4
Training Code
- GRPO training
- SFT training
- PPO training
⏳ Feature Support Plan
- Editing
  - Polyphone pronunciation control
  - More paralinguistic tags ([Cough, Crying, Stress, etc.])
  - Filler word removal
- Other Languages
  - Japanese, Korean
  - Arabic, French, Russian, Spanish, etc.

Online demonstration

StepFun Audio Studio

Both Step-Audio-EditX are available in our StepFun Audio Studio.
You will need an API key from the StepFun Open Platform.

WeChat group

You can scan the following QR code to join our WeChat group for communication and discussion.

Features

Zero-Shot TTS
- Excellent zero-shot TTS cloning for Mandarin, English, Sichuanese, and Cantonese.
- To use dialect or other languages, just add a [Sichuanese] / [Cantonese] / [Japanese] / [Korean] tag before your text.
- 🔥 Polyphone pronunciation control, all you need to do is replace the polyphonic characters with pinyin.
  - [我也想过过过儿过过的生活] -> [我也想guo4guo4guo1儿guo4guo4的生活]
Emotion and Speaking Style Editing
- Remarkably effective iterative control over emotions and styles, supporting dozens of options for editing.
  - Emotion Editing : [ Angry, Happy, Sad, Excited, Fearful, Surprised, Disgusted, etc. ]
  - Speaking Style Editing: [ Act_coy, Older, Child, Whisper, Serious, Generous, Exaggerated, etc.]
  - Editing with more emotion and more speaking styles is on the way. Get Ready! 🚀
Paralinguistic Editing
- Precise control over 10 types of paralinguistic features for more natural, human-like, and expressive synthetic audio.
- Supporting Tags:
  - [ Breathing, Laughter, Surprise-oh, Confirmation-en, Uhm, Surprise-ah, Surprise-wa, Sigh, Question-ei, Dissatisfaction-hnn ]
Available Tags

emotion	happy	Expressing happiness	angry	Expressing anger
sad	Expressing sadness	fear	Expressing fear
surprised	Expressing surprise	confusion	Expressing confusion
empathy	Expressing empathy and understanding	embarrass	Expressing embarrassment
excited	Expressing excitement and enthusiasm	depressed	Expressing a depressed or discouraged mood
admiration	Expressing admiration or respect	coldness	Expressing coldness and indifference
disgusted	Expressing disgust or aversion	humour	Expressing humor or playfulness
speaking style	serious	Speaking in a serious or solemn manner	arrogant	Speaking in an arrogant manner
child	Speaking in a childlike manner	older	Speaking in an elderly-sounding manner
girl	Speaking in a light, youthful feminine manner	pure	Speaking in a pure, innocent manner
sister	Speaking in a mature, confident feminine manner	sweet	Speaking in a sweet, lovely manner
exaggerated	Speaking in an exaggerated, dramatic manner	ethereal	Speaking in a soft, airy, dreamy manner
whisper	Speaking in a whispering, very soft manner	generous	Speaking in a hearty, outgoing, and straight-talking manner
recite	Speaking in a clear, well-paced, poetry-reading manner	act_coy	Speaking in a sweet, playful, and endearing manner
warm	Speaking in a warm, friendly manner	shy	Speaking in a shy, timid manner
comfort	Speaking in a comforting, reassuring manner	authority	Speaking in an authoritative, commanding manner
chat	Speaking in a casual, conversational manner	radio	Speaking in a radio-broadcast manner
soulful	Speaking in a heartfelt, deeply emotional manner	gentle	Speaking in a gentle, soft manner
story	Speaking in a narrative, audiobook-style manner	vivid	Speaking in a lively, expressive manner
program	Speaking in a show-host/presenter manner	news	Speaking in a news broadcasting manner
advertising	Speaking in a polished, high-end commercial voiceover manner	roar	Speaking in a loud, deep, roaring manner
murmur	Speaking in a quiet, low manner	shout	Speaking in a loud, sharp, shouting manner
deeply	Speaking in a deep and low-pitched tone	loudly	Speaking in a loud and high-pitched tone
paralinguistic	[sigh]	Sighing sound	[inhale]	Inhaling sound
[laugh]	Laughter sound	[chuckle]	Chuckling sound
[exhale]	Exhaling sound	[clears throat]	Throat clearing sound
[snort]	Snorting sound	[giggle]	Giggling sound
[cough]	Coughing sound	[breath]	Breathing sound
[uhm]	Hesitation sound: "Uhm"	[Confirmation-en]	Confirming: "En"
[Surprise-oh]	Expressing surprise: "Oh"	[Surprise-ah]	Expressing surprise: "Ah"
[Surprise-wa]	Expressing surprise: "Wa"	[Surprise-yo]	Expressing surprise: "Yo"
[Dissatisfaction-hnn]	Dissatisfied sound: "Hnn"	[Question-ei]	Questioning: "Ei"
[Question-ah]	Questioning: "Ah"	[Question-en]	Questioning: "En"
[Question-yi]	Questioning: "Yi"	[Question-oh]	Questioning: "Oh"

Feature Requests & Wishlist

💡 We welcome all ideas for new features! If you'd like to see a feature added to the project, please start a discussion in our Discussions section.

We'll be collecting community feedback here and will incorporate popular suggestions into our future development plans. Thank you for your contribution!

Demos

Task	Text	Source	Edited
Emotion-Fear	我总觉得，有人在跟着我，我能听到奇怪的脚步声。	fear_zh_female_prompt.webm	fear_zh_female_output.webm
Style-Whisper	比如在工作间隙，做一些简单的伸展运动，放松一下身体，这样，会让你更有精力。	whisper_prompt.webm	whisper_output.webm
Style-Act_coy	我今天想喝奶茶，可是不知道喝什么口味，你帮我选一下嘛，你选的都好喝～	act_coy_prompt.webm	act_coy_output.webm
Paralinguistics	你这次又忘记带钥匙了 [Dissatisfaction-hnn]，真是拿你没办法。	paralingustic_prompt.webm	paralingustic_output.webm
Denoising	Such legislation was clarified and extended from time to time thereafter. No, the man was not drunk, he wondered how we got tied up with this stranger. Suddenly, my reflexes had gone. It's healthier to cook without sugar.	denoising_prompt.webm	denoising_output.webm
Speed-Faster	上次你说鞋子有点磨脚，我给你买了一双软软的鞋垫。	speed_faster_prompt.webm	speed_faster_output.webm

For more examples, see demo page.

Model Download

Models	🤗 Hugging Face	ModelScope
Step-Audio-EditX	stepfun-ai/Step-Audio-EditX	stepfun-ai/Step-Audio-EditX
Step-Audio-EditX	stepfun-ai/Step-Audio-EditX-AWQ-4bit	stepfun-ai/Step-Audio-EditX-AWQ-4bit
Step-Audio-Tokenizer	stepfun-ai/Step-Audio-Tokenizer	stepfun-ai/Step-Audio-Tokenizer

Model Usage

📜 Requirements

The following table shows the requirements for running Step-Audio-EditX model (batch size = 1):

Model	Parameters	Setting (sample frequency)	GPU Optimal Memory
Step-Audio-EditX	3B	41.6Hz	12 GB

An NVIDIA GPU with CUDA support is required.
- The model is tested on a single L40S GPU.
- 12GB is just a critical value, and 16GB GPU memory shoule be safer.
Tested operating system: Linux

🔧 Dependencies and Installation

bash

git clone https://github.com/stepfun-ai/Step-Audio-EditX.git

cd Step-Audio-EditX
uv sync --refresh
source .venv/bin/activate

git lfs install
git clone https://huggingface.co/stepfun-ai/Step-Audio-Tokenizer
git clone https://huggingface.co/stepfun-ai/Step-Audio-EditX
git clone https://huggingface.co/stepfun-ai/Step-Audio-EditX-AWQ-4bit/

After downloading the models, where_you_download_dir should have the following structure:

where_you_download_dir
├── Step-Audio-Tokenizer
├── Step-Audio-EditX

Run with Docker

You can set up the environment required for running Step-Audio-EditX using the provided Dockerfile.

bash

# build docker
docker build . -t step-audio-editx

# run docker
docker run --rm --gpus all \
    -v /your/code/path:/app \
    -v /your/model/path:/model \
    -p 7860:7860 \
    step-audio-editx

Local Inference Demo

[!TIP] For optimal performance, keep audio under 30 seconds per inference.

bash

# zero-shot cloning
# The path of the generated audio file is output/fear_zh_female_prompt_cloned.wav
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "我总觉得，有人在跟着我，我能听到奇怪的脚步声。" \
    --prompt-audio "examples/fear_zh_female_prompt.wav" \
    --generated-text "可惜没有如果，已经发生的事情终究是发生了。" \
    --edit-type "clone" \
    --output-dir ./output 

python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "His political stance was conservative, and he was particularly close to margaret thatcher." \
    --prompt-audio "examples/zero_shot_en_prompt.wav" \
    --generated-text "Underneath the courtyard is a large underground exhibition room which connects the two buildings.	" \
    --edit-type "clone" \
    --output-dir ./output 

# edit
# There will be one or multiple wave files corresponding to each edit iteration, for example: output/fear_zh_female_prompt_edited_iter1.wav, output/fear_zh_female_prompt_edited_iter2.wav, ...
# emotion; fear
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "我总觉得，有人在跟着我，我能听到奇怪的脚步声。" \
    --prompt-audio "examples/fear_zh_female_prompt.wav" \
    --edit-type "emotion" \
    --edit-info "fear" \
    --output-dir ./output 

# emotion; happy
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "You know, I just finished that big project and feel so relieved. Everything seems easier and more colorful, what a wonderful feeling!" \
    --prompt-audio "examples/en_happy_prompt.wav" \
    --edit-type "emotion" \
    --edit-info "happy" \
    --output-dir ./output 

# style; whisper
# for style whisper, the edit iteration num should be set bigger than 1 to get better results.
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "比如在工作间隙，做一些简单的伸展运动，放松一下身体，这样，会让你更有精力." \
    --prompt-audio "examples/whisper_prompt.wav" \
    --edit-type "style" \
    --edit-info "whisper" \
    --output-dir ./output 

# paraliguistic 
# supported tags, Breathing, Laughter, Surprise-oh, Confirmation-en, Uhm, Surprise-ah, Surprise-wa, Sigh, Question-ei, Dissatisfaction-hnn
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "我觉得这个计划大概是可行的，不过还需要再仔细考虑一下。" \
    --prompt-audio "examples/paralingustic_prompt.wav" \
    --generated-text "我觉得这个计划大概是可行的，[Uhm]不过还需要再仔细考虑一下。" \
    --edit-type "paralinguistic" \
    --output-dir ./output 

# denoise
# Prompt text is not needed.
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-audio "examples/denoise_prompt.wav"\
    --edit-type "denoise" \
    --output-dir ./output 

# vad 
# Prompt text is not needed.
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-audio "examples/vad_prompt.wav" \
    --edit-type "vad" \
    --output-dir ./output 

# speed
# supported edit-info: faster, slower, more faster, more slower
python3 tts_infer.py \
    --model-path where_you_download_dir \
    --tokenizer-path where_you_download_dir \
    --prompt-text "上次你说鞋子有点磨脚，我给你买了一双软软的鞋垫。" \
    --prompt-audio "examples/speed_prompt.wav" \
    --edit-type "speed" \
    --edit-info "more faster" \
    --output-dir ./output 

Launch Web Demo

Start a local server for online inference. Assume you have one GPU with at least 12GB memory available and have already downloaded all the models.

bash

# Standard launch
python app.py --model-path where_you_download_dir --tokenizer-path where_you_download_dir --model-source local

# Using pre-quantized AWQ 4-bit models, memory-efficient mode (for limited GPU memory, ~6-8GB usage)
python app.py \
    --model-path path/to/quantized/model \
    --tokenizer-path where_you_download_dir \
    --model-source local \
    --gpu-memory-utilization 0.1 \
    --enforce-eager \
    --max-num-seqs 1 \
    --cosyvoice-dtype bfloat16 \
    --no-cosyvoice-cuda-graph

Available Parameters

Parameter	Default	Description
`--model-path`	(required)	Path to the model directory
`--model-source`	`auto`	Model source: `auto`, `local`, `modelscope`, `huggingface`
`--gpu-memory-utilization`	`0.5`	GPU memory ratio for vLLM KV cache (0.0-1.0)
`--max-model-len`	`3072`	Maximum sequence length, affects KV cache size
`--enforce-eager`	`True`	Disable vLLM CUDA Graphs (saves ~0.5GB memory)
`--max-num-seqs`	`1`	Maximum concurrent sequences (vLLM default: 256, lower = less memory)
`--dtype`	`bfloat16`	Model dtype: `float16`, `bfloat16`
`--quantization`	`None`	Quantization method: `awq`, `gptq`, `fp8`
`--cosyvoice-dtype`	`bfloat16`	CosyVoice vocoder dtype: `float32`, `bfloat16`, `float16`
`--no-cosyvoice-cuda-graph`	`False`	Disable CosyVoice CUDA Graphs (saves memory)
`--enable-auto-transcribe`	`False`	Enable automatic audio transcription

Memory Usage Guide

Configuration	Estimated GPU Memory	Use Case
Standard (defaults)	~12-15 GB	Best quality and speed
Memory-efficient	~6-8 GB	Limited GPU memory, some quality trade-off
AWQ 4-bit quantized	~8-10 GB	Good balance of quality and memory

Training

Please refer to script/ReadMe.md

🔄 Model Quantization (Optional)

For users with limited GPU memory, you can create quantized versions of the model to reduce memory requirements:

bash

# Create an AWQ 4-bit quantized model
python quantization/awq_quantize.py --model_path path/to/Step-Audio-EditX

# Advanced quantization options
python quantization/awq_quantize.py

For detailed quantization options and parameters, see quantization/README.md.

Technical Details

Step-Audio-EditX comprises three primary components:

A dual-codebook audio tokenizer, which converts reference or input audio into discrete tokens.
An audio LLM that generates dual-codebook token sequences.
An audio decoder, which converts the dual-codebook token sequences predicted by the audio LLM back into audio waveforms using a flow matching approach.

Audio-Edit enables iterative control over emotion and speaking style across all voices, leveraging large-margin data during SFT and PPO training.

Evaluation

Comparison between Step-Audio-EditX and Closed-Source models.

Step-Audio-EditX demonstrates superior performance over Minimax and Doubao in both zero-shot cloning and emotion control.
Emotion editing of Step-Audio-EditX significantly improves the emotion-controlled audio outputs of all three models after just one iteration. With further iterations, their overall performance continues to improve.

Generalization on Closed-Source Models.

For emotion and speaking style editing, the built-in voices of leading closed-source systems possess considerable in-context capabilities, allowing them to partially convey the emotions in the text. After a single editing round with Step-Audio-EditX, the emotion and style accuracy across all voice models exhibited significant improvement. Further enhancement was observed over the next two iterations, robustly demonstrating our model's strong generalization.
For paralinguistic editing, after editing with Step-Audio-EditX, the performance of paralinguistic reproduction is comparable to that achieved by the built-in voices of closed-source models when synthesizing native paralinguistic content directly. (sub means replacement of paralinguistic tags with native words)

**Table: Generalization of Emotion, Speaking Style, and Paralinguistic Editing on Closed-Source Models.**
Language	Model	Emotion ↑	Speaking Style ↑	Paralinguistic ↑
Iter₀	Iter₁	Iter₂	Iter₃	Iter₀	Iter₁	Iter₂	Iter₃	Iter₀	sub	Iter₁
Chinese	MiniMax-2.6-hd	71.6	78.6	81.2	83.4	36.7	58.8	63.1	67.3	1.73	2.80	2.90
Doubao-Seed-TTS-2.0	67.4	77.8	80.6	82.8	38.2	60.2	65.0	64.9	1.67	2.81	2.90
GPT-4o-mini-TTS	62.6	76.0	77.0	81.8	45.9	64.0	65.7	69.7	1.71	2.88	2.93
ElevenLabs-v2	60.4	74.6	77.4	79.2	43.8	63.3	69.7	70.8	1.70	2.71	2.92
English	MiniMax-2.6-hd	55.0	64.0	64.2	66.4	51.9	60.3	62.3	64.3	1.72	2.87	2.88
Doubao-Seed-TTS-2.0	53.8	65.8	65.8	66.2	47.0	62.0	62.7	62.3	1.72	2.75	2.92
GPT-4o-mini-TTS	56.8	61.4	64.8	65.2	52.3	62.3	62.4	63.4	1.90	2.90	2.88
ElevenLabs-v2	51.0	61.2	64.0	65.2	51.0	62.1	62.6	64.0	1.93	2.87	2.88
Average	MiniMax-2.6-hd	63.3	71.3	72.7	74.9	44.2	59.6	62.7	65.8	1.73	2.84	2.89
Doubao-Seed-TTS-2.0	60.6	71.8	73.2	74.5	42.6	61.1	63.9	63.6	1.70	2.78	2.91
GPT-4o-mini-TTS	59.7	68.7	70.9	73.5	49.1	63.2	64.1	66.6	1.81	2.89	2.90
ElevenLabs-v2	55.7	67.9	70.7	72.2	47.4	62.7	66.1	67.4	1.82	2.79	2.90

Acknowledgements

Part of the code and data for this project comes from:

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

License Agreement

The code in this open-source repository is licensed under the Apache 2.0 License.

Citation

@misc{yan2025stepaudioeditxtechnicalreport,
      title={Step-Audio-EditX Technical Report}, 
      author={Chao Yan and Boyong Wu and Peng Yang and Pengfei Tan and Guoqiang Hu and Yuxin Zhang and Xiangyu and Zhang and Fei Tian and Xuerui Yang and Xiangyu Zhang and Daxin Jiang and Gang Yu},
      year={2025},
      eprint={2511.03601},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2511.03601}, 
}

⚠️ Usage Disclaimer

Do not use this model for any unauthorized activities, including but not limited to:
- Voice cloning without permission
- Identity impersonation
- Fraud
- Deepfakes or any other illegal purposes
Ensure compliance with local laws and regulations, and adhere to ethical guidelines when using this model.
The model developers are not responsible for any misuse or abuse of this technology.

We advocate for responsible generative AI research and urge the community to uphold safety and ethical standards in AI development and application. If you have any concerns regarding the use of this model, please feel free to contact us.

stepfun-ai/Step-Audio-EditX

Step-Audio-EditX

🔥🔥🔥 News!!！

Introduction

📑 Open-source Plan

Online demonstration

StepFun Audio Studio

WeChat group

Features

Feature Requests & Wishlist

Demos

Model Download

Model Usage

📜 Requirements

🔧 Dependencies and Installation

Run with Docker

Local Inference Demo

Launch Web Demo

Available Parameters

Memory Usage Guide

Training

🔄 Model Quantization (Optional)

Technical Details

Evaluation

Comparison between Step-Audio-EditX and Closed-Source models.

Generalization on Closed-Source Models.

Acknowledgements

License Agreement

Citation

⚠️ Usage Disclaimer

Star History

stepfun-ai/
Step-Audio-EditX