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POST
Referencing a source track: Operations based on an existing song require no upstream ids—just pass task_id (our task_id of the job that produced the source track) + audio_index (which track in the result music[], 1-based, defaults to 1).

Authorizations

Authorization
string
required
All endpoints require authentication using a Bearer TokenGet an API Key:Visit the API Key management page to get your API KeyAdd the following to the request headers when using it:

Body

model
string
default:"suno"
Audio model. Currently pass suno (defaults to suno if omitted).
task_id
string
required
Our task_id of the job that produced the source track. If missing or the source cannot be resolved, a 400 is returned at submission time.
audio_index
integer
default:"1"
Which track in the source job’s result data.music[] (1-based; defaults to 1; a single generation usually produces 2 tracks: indexes 1 and 2).
infill_lyrics
string
Lyrics for the replacement section.
start_s
integer
required
Replacement start point (seconds; maps to the upstream infill_start_s). If missing, returns 400 immediately without hitting the upstream.
end_s
integer
required
Replacement end point (seconds; maps to the upstream infill_end_s). If missing, returns 400 immediately without hitting the upstream.
version
string
default:"v5.5"
Generation version: v4 / v4.5+ / v5 / v5.5; defaults to v5.5 if omitted. Any other value (including v3.5 / v4.5 / v4.5-all) returns 400 directly at submission time.
prompt
string
Context lyrics.
title
string
Title.
tags
string
Style tags.
negative_tags
string
Style tags to exclude.
Getting the result: This endpoint is an async task. After submitting you get a task_id; poll GET /v1/music/tasks/{task_id} at 3–5s intervals until status is completed or failed (music generation typically takes 30–120s; while generating, status is pending and progress goes queued 10 → ready 50 → done 100). On completion take the replaced audio_url from data.result.music[]. On failure data.error.message gives the reason and the pre-deducted quota is automatically refunded.

Response

code
integer
Response status code
data
array
Returned data array