ACE-Step
Open-source foundation model for lyrics-to-song music generation.
About
ACE-Step is an open-source music foundation model co-led by ACE Studio and StepFun that generates commercial-grade stereo music with lyrics from text prompts. It pairs a language-model planner with a diffusion-transformer synthesizer, supports 50+ languages, and runs on consumer GPUs (under 4GB of VRAM when offloaded).
A newer 1.5 release pushes quality further, but generation stays slow on modest hardware and results vary by genre.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 7/10
Scored 7/10 (verified tier, metrics-v1). Evidence: growing open-source music community; 1.5 follow-up release; runs on consumer GPUs with offloading; generation speed and genre variance are real limits. License: Open-source; check the GitHub repo for the exact license terms..
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 6.0/10
- Maintenance · recency, releases, issue load
- 7.0/10
- Openness · license + docs
- 9.0/10
- Manual review · sanity read + red-flag check
- 7.0/10
- · growing open-source music community; 1.5 follow-up release
- · runs on consumer GPUs with offloading
- · generation speed and genre variance are real limits