Model reference · open weights
Ace-Step1.5 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 🚀 ACE-Step v1.5 is a highly efficient open-source music foundation model designed to bring commercial-grade music generation to consumer hardware. Key Features 💰 Commercial-Ready: Unlike many models trained on ambiguous datasets, ACE-Step v1.5 is designed for creators. You can strictly use the generated music for commercial purposes. 📚 Safe & Robust Training Data: The model is trained on a massive, legally compliant dataset consisting of: Licensed Data: Professionally licensed music tracks. Royalty-Free / No-Copyright Data: A vast collection of public domain and royalty-free music. Synthetic Data: High-quality audio generated via advanced MIDI-to-Audio conversion. ⚡ Extreme Speed: Generates a full song in under 2 seconds on an A100 and under 10 seconds on an RTX 3090. 🖥️ Consumer Hardware Friendly: Runs locally with less than 4GB of VRAM. Technical Capabilities 🌉 At its core lies a novel hybrid architecture where the Language Model (LM) functions as an omni-capable planner: it transforms simple user queries into comprehensive song blueprints—scaling from short loops to 10-minute compositions—while synthesizing metadata, lyrics, and captions via Chain-of-Thought to guide the Diffusion Transformer (DiT). ⚡ Uniquely, this alignment is achieved through intrinsic reinforcement learning relying solely on the model's internal mechanisms, thereby eliminating the biases inherent in external reward models or human preferences. 🎚️ 🔮 Beyond standard synthesis, ACE-Step v1.5 unifies precise stylistic control with versatile editing capabilities—such as cover generation, repainting, and vocal-to-BGM conversion—while maintaining strict adherence to prompts across 50+ languages. This paves the way for powerful tools that seamlessly integrate into the creative workflows of music artists, producers, and content creators. 🎸 - Developed by: [ACE-STEP] - Model type: [Text2Music] - Language(s): [50+ languages] - License: [MIT] Evaluation 🏗️ Architecture 🦁 Model Zoo DiT Models LM Models 🙏 Acknowledgements This project is co-led by ACE Studio and StepFun. 📖 Citation If you find this project useful for your research, please consider citing:
Summarised from the published model card. Read the full card on the HuggingFace links below.
Specifications
| Maker | ACE-Step |
|---|---|
| Type | Audio & music |
| Variants | 1 |
| Runs with | transformers |
| Released | 2026-01-23 |
| Popularity | 53k downloads / month |
| Likes | 842 |
| 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.
| Variant | Params | Precision | VRAM | Fits 16 GB | Weights |
|---|---|---|---|---|---|
| Ace-Step1.5 | — | BF16 | — | — | Weights ↗ |
Using it via the API
Once AxForge deploys ace-step1-5 for you, it answers on the OpenAI-compatible API — the same base URL and keys as every other model. (ace-step1-5 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="ace-step1-5" -F file=@audio.mp3
Licence
Open weights under mit — commercial use is permitted. Deploy it on AxForge EU hardware on request. Read the licence ↗