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ACE-Step 1.5

GitHub stars: 13K GitHub forks: 1.7K Declared license: MIT: MIT Last pushed September 3, 2026: Pushed 27d ago
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ACE-Step 1.5 is a locally runnable music model for generating songs and revising audio, with reference-guided creation, repainting and model-dependent stem tools.

A language model can plan the song and a diffusion model produces audio. The project offers 2B and XL 4B diffusion variants, a local interface and API, plus hosted demonstration paths. Use this as a first read, not a recommendation. Open the original project before trusting details like terms, limits, privacy, cost, setup, or safety.

What it is

Draft a song, then revise the audio

A creator with a rough track can regenerate a selected passage or guide a new result with reference audio. This gives a revision path beyond replacing the whole song with another text prompt.

Why it stands out

Planning and audio generation are separate

The language model supplies song planning and rewriting; the diffusion model produces audio. The documented low-memory DiT-only path disables the language model, so the smallest setup does not include the same planning stage.

Availability

Local models with different requirements

The repository documents Python 3.11–3.12, local UI/API paths and several hardware backends. The 2B baseline and XL 4B variants have different memory requirements; a hosted demo's access and data handling are separate from running locally.

Why it matters

What makes it useful

If one passage needs changing while the rest of a draft should remain the starting point, repainting targets a selected region. Listen across its boundaries afterward: the project's limitations include rough transitions and inconsistent results across seeds and durations.

Notable points

What stands out

The v0.1.8 release adds Retake variation generation. Its retake_variance control mixes fresh noise into the diffusion start on a 0–1 scale, providing an explicit variation control rather than changing the prompt alone.

Before using

What to review

Choose the model by both task support and memory. The project's base, SFT and turbo variants do not expose every task in the same way.

The 2B guide lists at least 4 GB VRAM for DiT-only and 6 GB for language-model-plus-DiT use. XL needs more memory; CPU inference is supported but described as substantially slower.

The project reports inconsistent generations, coarse vocals and limited fine control. Its performance and quality claims are not an independent LifeHubber listening test.

The project's current terms are linked on its repository.

Reader fit

Who may find it relevant

Musicians experimenting with generated drafts, reference audio and selective revision on their own hardware.

Builders connecting a local music interface or API to a broader production workflow.

Someone wanting a finished hosted service or complete arranging and mixing tools may need a different setup.

Editorial note

Why LifeHubber lists it

Stem extraction and adding a musical layer need the right checkpoint. In the project's task matrix, Extract, Lego and Complete are supported by the base variants, while the SFT and turbo variants do not support those tasks. Pick that capability before choosing a model for its generation speed.

Source links

Source materials

Reader note

Before relying on this entry

LifeHubber lists entries to help readers inspect AI projects, not to endorse them or prove they are safe, suitable, accurate, maintained, or right for a specific use. We do not verify every entry in depth. Before relying on anything listed, review the original materials, terms, privacy practices, limits, and risks that matter for your situation.

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