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Extend an existing song or uploaded audio.

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Model

suno-ai/extend

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Parameters

ParameterTypeRequiredDescription
mvstringYesModel version
custombooleanYesSimple or custom mode
clip_idstringNoExisting Suno clip ID to extend
audio_urlstringNoAudio file URL to extend
continue_atnumberYesTime in seconds where extension should begin
gpt_description_promptstringNoSimple mode description
promptstringNoCustom mode lyrics/prompt
titlestringNoTitle for extended version
make_instrumentalbooleanNoGenerate instrumental
custom_modelobjectNoRequired when mv is chirp-custom. Inline custom model — { "name": string, "audio_urls": string[] }. See Music Generation › Custom Model
Provide either clip_id (for Suno-generated clips) or audio_url (for uploaded audio).

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Example - Extend Existing Clip

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/extend",
    "input": {
      "mv": "chirp-bluejay",
      "custom": false,
      "clip_id": "69ad968a-23c4-40e0-9cdc-80f9649c5209",
      "continue_at": 99.6,
      "gpt_description_prompt": "Continue the epic chorus"
    }
  }'

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Example - Upload and Extend

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "suno-ai/extend",
    "input": {
      "mv": "chirp-bluejay",
      "custom": true,
      "audio_url": "https://example.com/audio.mp3",
      "continue_at": 60,
      "prompt": "[Verse 3]\nExtended lyrics here...",
      "title": "Extended Version"
    }
  }'

​
Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "pending"
  }
}