Model reference · open weights
acestep-xl is an open-weight audio or speech model from ACE-Step, listed in the AxForge catalogue. AxForge can bring it up on EU-owned hardware for you on request — with the licence handled where one is required.
About
Model Details This is the XL (4B) Turbo variant of ACE-Step 1.5 — a distillation-accelerated model that generates high-quality audio in just 8 steps. Combines the speed of turbo with the quality of the 4B architecture. 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. - ⚡ Fast: 8-step inference — the fastest XL variant. - 🔮 Higher Quality: 4B parameters provide richer audio quality than 2B turbo. Quick Start Model Zoo XL (4B) DiT Models LM Models (all compatible with XL) Acknowledgements This project is co-led by ACE Studio and StepFun. Citation
Summarised from the published model card. Read the full card on the HuggingFace links below.
Specifications
| Maker | ACE-Step |
|---|---|
| Type | Audio & music |
| Parameters (lead) | 5.0B |
| Variants | 2 |
| Runs with | transformers |
| Released | 2026-04-02 |
| Popularity | 4k downloads / month |
| Likes | 205 |
| Licence | Open weights |
How it works
Variants
Open weights ship in several sizes and precisions. One page, all the variants — pick the one that fits your GPU. VRAM figures are estimates from model size.
Using it via the API
Once AxForge deploys acestep-xl for you, it answers on the OpenAI-compatible API — the same base URL and keys as every other model. (acestep-xl below is illustrative; you get the exact model name on deployment.)
$ curl -sS https://api.axforge.ai/v1/audio/transcriptions \ -H "Authorization: Bearer $AXFORGE_API_KEY" \ -F model="acestep-xl" -F file=@audio.mp3
Licence
Open weights under mit — commercial use is permitted. Deploy it on AxForge EU hardware on request. Read the licence ↗