Extend Music - Unifically

Extend an existing song or uploaded audio.

Model

suno-ai/extend

Parameters

Parameter	Type	Required	Description
`mv`	string	Yes	Model version
`custom`	boolean	Yes	Simple or custom mode
`clip_id`	string	No	Existing Suno clip ID to extend
`audio_url`	string	No	Audio file URL to extend
`continue_at`	number	Yes	Time in seconds where extension should begin
`gpt_description_prompt`	string	No	Simple mode description
`prompt`	string	No	Custom mode lyrics/prompt
`title`	string	No	Title for extended version
`make_instrumental`	boolean	No	Generate instrumental
`custom_model`	object	No	Required 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).

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"
    }
  }'

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": "processing"
  }
}

⌘I