Suno · Music

Extend Song

📌 What is this：Continue an existing song to make it longer.

💡 When to use：Use when a song is too short or you want to add a chorus.

Endpoints

Usage	Method	Path
Submit task	POST	/api/cqt/generator/suno
Query Result	GET	/api/cqt/info/suno?id={taskId}

Request Parameters

Param	Type	Required	Description
task	string	Required	Fixed value: extend
model	string	Required	Model version
clipId	string	Required	ID of the clip to extend
continueAt	number	—	Second to continue from

Advanced Parameters (optional)

Param	Type	Description
styleWeight	number(0~1)	Style weight; higher sticks closer to tags
audioWeight	number(0~1)	Original-audio influence weight (for audio-based tasks)
weirdnessConstraint	number(0~1)	Creativity / weirdness; higher is bolder
personaId	string	Voice persona ID (sing with a persona)
artistClipId	string	Reference clip ID for style

Request Example

curl -X POST https://api.cqtai.com/api/cqt/generator/suno \
  -H 'Authorization: Bearer <API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{ "task":"extend", "model":"v55", "clipId":"6e1f9e23-09f6-43d2-812a-59a154459082", "continueAt":30 }'
# -> { "code":200, "data":"<taskId>" }

Response Example

{
  "code": 200,
  "msg": "success",
  "data": {
    "id": "95605f2d10624032baabc3b1db41a7e8",
    "taskType": "extend",
    "status": "succeeded",
    "errorMsg": "",
    "param": {
      "task": "extend",
      "model": "chirp-v55",
      "clipId": "6e1f9e23-09f6-43d2-812a-59a154459082",
      "continueAt": 30
    },
    "result": [
      {
        "id": "3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176",
        "title": "",
        "handle": "ernabillstbwsd",
        "status": "complete",
        "user_id": "f04d4d05-dd5c-4f54-ac37-3357099b2ce1",
        "metadata": {
          "tags": "",
          "task": "extend",
          "type": "gen",
          "prompt": "",
          "duration": 73.68,
          "is_remix": true,
          "continue_at": 30,
          "edited_clip_id": "6e1f9e23-09f6-43d2-812a-59a154459082",
          "history": [
            { "id": "6e1f9e23-09f6-43d2-812a-59a154459082", "type": "gen", "source": "ios", "continue_at": 30 }
          ],
          "make_instrumental": false,
          "uses_latest_model": true
        },
        "audio_url": "https://cdn1.suno.ai/3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.mp3",
        "video_url": "https://cdn1.suno.ai/3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.mp4",
        "image_url": "https://cdn2.suno.ai/image_3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.jpeg",
        "image_large_url": "https://cdn2.suno.ai/image_large_3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.jpeg",
        "clip_roots": {
          "clips": [
            {
              "id": "6e1f9e23-09f6-43d2-812a-59a154459082",
              "title": "Książę z Mroczną Przeszłością",
              "image_url": "https://cdn2.suno.ai/image_6e1f9e23-09f6-43d2-812a-59a154459082.jpeg",
              "user_handle": "ernabillstbwsd",
              "user_display_name": "ernabillstbwsd"
            }
          ],
          "clip_attribution_type": "remix"
        },
        "media_urls": [
          { "url": "https://d2lwuy8qc234o3.cloudfront.net/1/clip/3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.m4a", "delivery": "progressive", "content_type": "m4a-opus" },
          { "url": "https://cdn1.suno.ai/3c7a9faf-81b4-4bc1-8ee1-1bfc8f07c176.mp3", "delivery": "progressive", "content_type": "mp3" }
        ],
        "model_name": "chirp-fenix",
        "batch_index": 0,
        "created_at": "2026-07-08T06:41:34.279Z",
        "major_model_version": "v5.5"
      },
      {
        "id": "c01622cb-8159-4865-91af-754ed215b51c",
        "title": "",
        "status": "complete",
        "metadata": {
          "task": "extend",
          "duration": 44.4,
          "is_remix": true,
          "continue_at": 30,
          "avg_bpm": 83.99,
          "history": [
            { "id": "6e1f9e23-09f6-43d2-812a-59a154459082", "type": "gen", "continue_at": 30 }
          ]
        },
        "audio_url": "https://cdn1.suno.ai/c01622cb-8159-4865-91af-754ed215b51c.mp3",
        "video_url": "https://cdn1.suno.ai/c01622cb-8159-4865-91af-754ed215b51c.mp4",
        "image_url": "https://cdn2.suno.ai/image_c01622cb-8159-4865-91af-754ed215b51c.jpeg",
        "model_name": "chirp-fenix",
        "batch_index": 1,
        "major_model_version": "v5.5"
      }
    ],
    "createTime": "2026-07-08 14:41:32",
    "completeTime": "2026-07-08 14:43:08"
  }
}

Response Fields

Field	Type	Description
code	number	Status code; 200 = success
msg	string	Message
data.id	string	Task ID (the taskId returned on submit; used to poll)
data.taskType	string	Task type; matches the submitted task
data.status	string	Status: pending / succeeded / failed
data.errorMsg	string	Failure reason; empty on success
data.param	object	Echo of the request params you submitted
data.result	array	Results; returns 2 candidate clips
data.result[].id	string	The generated clipId; reusable for further extend / cover, etc.
data.result[].audio_url	string	Audio file URL (mp3)
data.result[].video_url	string	Video file URL (mp4); may be empty, re-query later
data.result[].image_url	string	Cover image URL (image_large_url is the large one)
data.result[].title	string	Song title
data.result[].status	string	Clip status; "complete" = ready to download
data.result[].metadata.duration	number	Total audio duration (seconds)
data.result[].metadata.tags	string	Style tags
data.result[].metadata.continue_at	number	Second in the source song where the continuation starts
data.result[].metadata.history	array	Lineage: which clip and second this continues from
data.result[].metadata.is_remix	bool	Whether it is a remix; always true for extend
data.result[].clip_roots	object	Source (parent) clip info: title / cover / author
data.result[].media_urls	array	Multi-format audio URLs (m4a-opus / mp3)
data.result[].batch_index	number	Candidate index (0, 1)
data.result[].major_model_version	string	Model version used, e.g. v4.5 / v5.5
data.createTime / completeTime	string	Task submit time / completion time
其它字段	—	action_config / model_badges / secondary_badges / ownership / avatar_image_url, etc. are for Suno UI and can be ignored

Billing & Credits

30 credits (x your user rate). Auto-refunded on failure.