cmp-nct / acestep-v15-xl-base

ACE-Step 1.5 XL — Base (4B DiT)

Project | Hugging Face | ModelScope | Space Demo | Discord | Tech Report

Model Details

This is the XL (4B) Base variant of ACE-Step 1.5 — a larger DiT decoder with ~4B parameters for higher audio quality. It is the foundation model supporting all tasks: text-to-music, cover, repaint, extract, lego, and complete.

XL Architecture

GPU Requirements

All LM models (0.6B / 1.7B / 4B) are fully compatible with XL.

Key Features

• 💰 Commercial-Ready: Trained on legally compliant datasets. Generated music can be used for commercial purposes.
• 📚 Safe Training Data: Licensed music, royalty-free/public domain, and synthetic (MIDI-to-Audio) data.
• 🎯 Full Task Support: Text2Music, Cover, Repaint, Extract, Lego, Complete.
• 🔮 Higher Quality: 4B parameters provide richer audio quality compared to the 2B variants.

Quick Start

# Install ACE-Step
git clone https://github.com/ace-step/ACE-Step-1.5.git
cd ACE-Step-1.5
pip install -e .

# Download this model
huggingface-cli download ACE-Step/acestep-v15-xl-base --local-dir ./checkpoints/acestep-v15-xl-base

# Run with Gradio UI
python acestep --config-path acestep-v15-xl-base

Model Zoo

XL (4B) DiT Models

2B DiT Models

LM Models (all compatible with XL)

Acknowledgements

This project is co-led by ACE Studio and StepFun.

Citation

@misc{gong2026acestep,
    title={ACE-Step 1.5: Pushing the Boundaries of Open-Source Music Generation},
    author={Junmin Gong, Yulin Song, Wenxiao Zhao, Sen Wang, Shengyuan Xu, Jing Guo},
    howpublished={\url{https://github.com/ace-step/ACE-Step-1.5}},
    year={2026},
    note={GitHub repository}
}