Audio

Upload and Extend Audio audio

Upload audio and extend it into a longer track.

Category: Music · suno-upload-and-extend

How to use & limits

Extend uploaded audio using custom mode with style, title and a continuation point.
Simple mode returned a provider error in testing; prefer custom mode.
Audio may be up to 8 minutes, or 1 minute for v4_5all.
Versions: v4, v4_5, v4_5all, v4_5plus, v5 and v5_5.

Capabilities

What this model supports, straight from the schema — no pricing, no infrastructure detail.

Capability	Value
`music` Music	Yes
`max_prompt_length` Max prompt length	5000
`source_audio_required` Source audio required	Yes

Parameters

Fields accepted in params (or first-class, where applicable) for POST /generations.

Name	Label	Type	Required	Default	Options	Min / Max	Description
`audio_url`	Source audio URL	url	Required	—	—	—	URL of the uploaded audio.
`style`	Style / genre	text	Optional	—	—	—	Music style; required in custom mode.
`model_version`	Version	select	Optional	v4_5	v3_5 · v4 · v4_5 · v4_5plus	—	Model version.
`prompt`	Prompt	textarea	Required	—	—	—	Optional vocal lyrics or direction.

Example request

bash

curl -X POST https://caranguejo.art/api/v1/dev/generations \
  -H "Authorization: Bearer $CK" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "suno-upload-and-extend",
  "prompt": "",
  "params": {
    "model_version": "v5",
    "default_param_flag": true,
    "instrumental": true,
    "style": "ambient synthesizer",
    "title": "Ambient continuation",
    "continue_at_seconds": 20
  }
}'

javascript

const res = await fetch("https://caranguejo.art/api/v1/dev/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer " + process.env.CK,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "suno-upload-and-extend",
    "prompt": "",
    "params": {
      "model_version": "v5",
      "default_param_flag": true,
      "instrumental": true,
      "style": "ambient synthesizer",
      "title": "Ambient continuation",
      "continue_at_seconds": 20
    }
  }),
});
const { data } = await res.json();

Example response

json

{
  "id": "9f0c1a7e-…",
  "object": "generation",
  "model": "suno-upload-and-extend",
  "type": "audio",
  "status": "completed",
  "output": {
    "assets": [
      {
        "url": "https://media.caranguejo.art/outputs/example.mp3",
        "type": "audio"
      }
    ]
  }
}

The job's real cost is returned as credits_charged on the completed response — check GET /balance for the account balance.

Common errors for this job type:

`insufficient_credits`	Account balance can't cover the job cost.
`content_policy_violation`	Prompt or media rejected by content policy.
`generation_timeout`	The job exceeded the maximum processing time.
`rate_limited`	Too many requests per minute.
`invalid_input`	A required parameter is missing or outside the model's schema.
`generation_failed`	Generic processing failure.