StepAudio 3 Music API

About StepAudio 3 Music

Writes complete songs from a style description, with vocals, arrangement, and mixing, or instrumentals and covers.

Generation is asynchronous and usually takes from tens of seconds to a few minutes.

Also known as StepFun StepAudio 3 Music

StepAudio 3 Music specs

Model ID

stepaudio-3-music

Author

StepFun

Category

Audio Generation

Released

Sep 8, 2026

Input

TextAudio

Output

Audio

Region

International

Endpoints

POST/v1/audio/generations

Alternate model IDs

stepaudio-3-music-previewstepfun/stepaudio-3-music

StepAudio 3 Music API pricing

Live pay-as-you-go rates from the EmpirioLabs catalog. You are billed only for what you use, with no monthly minimum.

How to call the StepAudio 3 Music API

StepAudio 3 Music runs through POST /v1/audio/generations. The request returns a job_id right away; poll GET /v1/jobs/{job_id} until the job completes and read the output URLs from the result. Get an API key from the EmpirioLabs dashboard.

curl https://api.empiriolabs.ai/v1/audio/generations \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepaudio-3-music",
    "prompt": "Describe what you want StepAudio 3 Music to generate."
  }'

curl https://api.empiriolabs.ai/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY"

import requests

response = requests.post(
    "https://api.empiriolabs.ai/v1/audio/generations",
    headers={"Authorization": "Bearer YOUR_EMPIRIOLABS_API_KEY"},
    json={
        "model": "stepaudio-3-music",
        "prompt": "Describe what you want StepAudio 3 Music to generate.",
    },
)
job = response.json()

# Generation runs as an async job. Poll until it completes.
import time
while True:
    status = requests.get(
        f"https://api.empiriolabs.ai/v1/jobs/{job['job_id']}",
        headers={"Authorization": "Bearer YOUR_EMPIRIOLABS_API_KEY"},
    ).json()
    if status.get("status") in ("completed", "failed"):
        print(status)
        break
    time.sleep(5)

StepAudio 3 Music API parameters

Request parameters supported by the StepAudio 3 Music API on EmpirioLabs. Defaults apply when a field is omitted.

Good to know

Describe the style and the model writes and performs a complete song. Supply lyrics or let the model write them, set instrumental for a track with no vocals, or attach a reference song for a cover or a dry vocal to build an arrangement around. Section tags such as [Verse], [Chorus], and [Outro] shape the structure. Output length is chosen by the model and is typically one to three minutes, so it is not set by a parameter and two runs of the same prompt can differ. Billing follows the generated length. Instrumental and lyrics cannot be combined. This model is in preview and its capabilities may change.

StepAudio 3 Music API: common questions

How much does the StepAudio 3 Music API cost?

On EmpirioLabs, StepAudio 3 Music is billed pay as you go: Music generation $0.0018 per generated second. The live rate card on this page always matches what the API charges.

Which endpoint does StepAudio 3 Music use?

StepAudio 3 Music is served through POST /v1/audio/generations on api.empiriolabs.ai with standard bearer-token authentication.

Can I try StepAudio 3 Music in the browser before integrating?

Yes. The EmpirioLabs playground runs StepAudio 3 Music in the browser with the same parameters the API exposes, so you can test prompts before writing code.

How do I get a StepAudio 3 Music API key?

Create an EmpirioLabs account, then generate a key under API Keys in the dashboard. Billing is pay-as-you-go credits, so you only pay for the requests you make.