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API Reference
API Reference

Suno Separate-Audio-Stems

Use the separate audio stems endpoint to create an asynchronous Task.

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01

Overview

Use the separate audio stems endpoint with the required inputs. Use the returned Task ID to retrieve its state, or provide callback_url for the deliveries documented below.

Quick start

  1. Create an API key and set it as RUNAPI_API_KEY.
  2. Send a POST request whose body matches the request schema.
  3. Store the returned task ID, then poll until a terminal state or handle the callbacks documented below.

Endpoint

POST /api/v1/suno/separate_audio_stems
Base URL
https://runapi.ai
API version
v1
Authentication
Authorization: Bearer YOUR_API_TOKEN
02

Supported models

Open a model page for current pricing, rate limits, and commercial-usage details.

03

Request schema

JSON body

Send only the documented fields. When supplied, callback_url receives the Task deliveries documented below.

Request body5 fields
audio_idstring
Required

Audio ID within the source task.

callback_urlstring
Optional

Webhook URL for async notifications.

stem_namestring
Optional

Target stem for advanced separation. Required when type is split_stem_advanced.

Allowed values: Lead Vocal, Drum Kit, Kick, Snare, Risers, Bass, Backing Vocals, Piano, Electric Guitar, Percussion, String Section, Synth, Acoustic Guitar, Sound Effects, Synth Pad, Synth Bass, Guitar, Brass Section, Organ, Electronic Drum Kit, Lead Electric Guitar, Synth Keys, Rhythm Electric Guitar, Electric Piano, Upright Bass, Keyboards, Distorted Electric Guitar, Synth Strings, Synth Lead, Woodwinds, Rhythm Acoustic Guitar, Flute, Harp, Tambourine, Trumpet, Arpeggiator, Accordion, Fiddle, Pedal Steel Guitar, Synth Voice, Violin, Digital Piano, Synth Brass, Mandolin, Choir, Banjo, Bells, Clarinet, Tenor Saxophone, Trombone, Shaker, French Horn, Glockenspiel, Electric Bass, Cello, Timpani, Harmonica, Marimba, Vibraphone, Lap Steel Guitar, Saxophone, Orchestra, Horns, Cymbals, Hand Clap, Oboe, Celesta, Congas, Drone, Alto Saxophone, Double Bass, Ukulele, Harpsichord, Baritone Saxophone, Xylophone, Tuba, Bass Guitar, Whistle, Lead Guitar, Rhodes, 808, Bongos, Bassoon, Cowbell, Viola, Sitar, Steel Drums, Piccolo, Theremin, Bagpipes, Hi-Hat, Music Box, Melodica, Tabla, Koto, Djembe, Taiko, Didgeridoo
task_idstring
Required

Source task ID.

typestring
Optional

Stem separation mode.

Allowed values: separate_vocal, split_stem, split_stem_advanced Default: separate_vocal

Conditional rules

These requirements apply when all listed conditions match.

  1. When type = split_stem_advanced
    Required
    stem_name
    Not accepted
04

Create acceptance

HTTP 202

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "billing": {
      "properties": {
        "refund": {
          "oneOf": [
            {
              "properties": {
                "refunded_at": {
                  "type": "string"
                }
              },
              "required": [
                "refunded_at"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "reservation": {
          "oneOf": [
            {
              "properties": {
                "amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "amount_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "settlement": {
          "oneOf": [
            {
              "properties": {
                "amount_micro_cents": {
                  "type": "integer"
                },
                "charged_amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "charged_amount_cents",
                "amount_micro_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        }
      },
      "required": [
        "reservation",
        "settlement",
        "refund"
      ],
      "type": "object",
      "unevaluatedProperties": false
    },
    "id": {
      "type": "string"
    },
    "status": {
      "enum": [
        "processing"
      ],
      "type": "string"
    },
    "task_replayed": {
      "type": "boolean"
    }
  },
  "required": [
    "id",
    "status",
    "billing"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "billing": {
    "refund": null,
    "reservation": null,
    "settlement": null
  },
  "id": "tsk_reference_demo",
  "status": "processing"
}
05

Polling processing

HTTP 200

GET /api/v1/suno/separate_audio_stems/:id

Response schema
JSON 
{
  "properties": {
    "billing": {
      "properties": {
        "refund": {
          "oneOf": [
            {
              "properties": {
                "refunded_at": {
                  "type": "string"
                }
              },
              "required": [
                "refunded_at"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "reservation": {
          "oneOf": [
            {
              "properties": {
                "amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "amount_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "settlement": {
          "oneOf": [
            {
              "properties": {
                "amount_micro_cents": {
                  "type": "integer"
                },
                "charged_amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "charged_amount_cents",
                "amount_micro_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        }
      },
      "required": [
        "reservation",
        "settlement",
        "refund"
      ],
      "type": "object",
      "unevaluatedProperties": false
    },
    "id": {
      "type": "string"
    },
    "separated_audios": {
      "properties": {
        "backing_vocals_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "bass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "brass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "drums_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "fx_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "guitar_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "instrumental_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "keyboard_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "pairs": {
          "items": {
            "properties": {
              "extracted_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "remaining_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "stem_name": {
                "type": "string"
              }
            },
            "required": [
              "stem_name",
              "extracted_audio",
              "remaining_audio"
            ],
            "type": "object",
            "unevaluatedProperties": false
          },
          "type": "array"
        },
        "percussion_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "piano_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "strings_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "synth_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "vocal_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "woodwinds_url": {
          "type": "string",
          "x-runapi-generated-media": true
        }
      },
      "type": "object",
      "unevaluatedProperties": false
    },
    "status": {
      "enum": [
        "processing"
      ],
      "type": "string"
    }
  },
  "required": [
    "id",
    "status",
    "billing"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "billing": {
    "refund": null,
    "reservation": null,
    "settlement": null
  },
  "id": "tsk_reference_demo",
  "status": "processing"
}
06

Polling completed

HTTP 200

GET /api/v1/suno/separate_audio_stems/:id

Response schema
JSON 
{
  "properties": {
    "billing": {
      "properties": {
        "refund": {
          "oneOf": [
            {
              "properties": {
                "refunded_at": {
                  "type": "string"
                }
              },
              "required": [
                "refunded_at"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "reservation": {
          "oneOf": [
            {
              "properties": {
                "amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "amount_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "settlement": {
          "oneOf": [
            {
              "properties": {
                "amount_micro_cents": {
                  "type": "integer"
                },
                "charged_amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "charged_amount_cents",
                "amount_micro_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        }
      },
      "required": [
        "reservation",
        "settlement",
        "refund"
      ],
      "type": "object",
      "unevaluatedProperties": false
    },
    "id": {
      "type": "string"
    },
    "separated_audios": {
      "properties": {
        "backing_vocals_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "bass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "brass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "drums_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "fx_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "guitar_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "instrumental_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "keyboard_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "pairs": {
          "items": {
            "properties": {
              "extracted_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "remaining_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "stem_name": {
                "type": "string"
              }
            },
            "required": [
              "stem_name",
              "extracted_audio",
              "remaining_audio"
            ],
            "type": "object",
            "unevaluatedProperties": false
          },
          "type": "array"
        },
        "percussion_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "piano_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "strings_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "synth_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "vocal_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "woodwinds_url": {
          "type": "string",
          "x-runapi-generated-media": true
        }
      },
      "type": "object",
      "unevaluatedProperties": false
    },
    "status": {
      "enum": [
        "completed"
      ],
      "type": "string"
    }
  },
  "required": [
    "id",
    "status",
    "separated_audios",
    "billing"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "billing": {
    "refund": null,
    "reservation": null,
    "settlement": null
  },
  "id": "tsk_reference_demo",
  "separated_audios": {
    "instrumental_url": "https://file.runapi.ai/reference-instrumental.mp3",
    "vocal_url": "https://file.runapi.ai/reference-vocals.mp3"
  },
  "status": "completed"
}
07

Polling failed

HTTP 200

GET /api/v1/suno/separate_audio_stems/:id

Response schema
JSON 
{
  "properties": {
    "billing": {
      "properties": {
        "refund": {
          "oneOf": [
            {
              "properties": {
                "refunded_at": {
                  "type": "string"
                }
              },
              "required": [
                "refunded_at"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "reservation": {
          "oneOf": [
            {
              "properties": {
                "amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "amount_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        },
        "settlement": {
          "oneOf": [
            {
              "properties": {
                "amount_micro_cents": {
                  "type": "integer"
                },
                "charged_amount_cents": {
                  "type": "integer"
                }
              },
              "required": [
                "charged_amount_cents",
                "amount_micro_cents"
              ],
              "type": "object",
              "unevaluatedProperties": false
            },
            {
              "enum": [
                null
              ]
            }
          ]
        }
      },
      "required": [
        "reservation",
        "settlement",
        "refund"
      ],
      "type": "object",
      "unevaluatedProperties": false
    },
    "error": {
      "type": "string"
    },
    "id": {
      "type": "string"
    },
    "status": {
      "enum": [
        "failed"
      ],
      "type": "string"
    }
  },
  "required": [
    "id",
    "status",
    "error",
    "billing"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "billing": {
    "refund": null,
    "reservation": null,
    "settlement": null
  },
  "error": "Task processing failed.",
  "id": "tsk_reference_demo",
  "status": "failed"
}
08

Customer callback: completed

HTTP 200

POST callback_url

Response schema
JSON 
{
  "properties": {
    "id": {
      "type": "string"
    },
    "separated_audios": {
      "properties": {
        "backing_vocals_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "bass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "brass_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "drums_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "fx_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "guitar_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "instrumental_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "keyboard_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "pairs": {
          "items": {
            "properties": {
              "extracted_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "remaining_audio": {
                "properties": {
                  "audio_url": {
                    "type": "string",
                    "x-runapi-generated-media": true
                  },
                  "duration_seconds": {
                    "type": "number"
                  },
                  "id": {
                    "type": "string"
                  }
                },
                "required": [
                  "id",
                  "duration_seconds",
                  "audio_url"
                ],
                "type": "object",
                "unevaluatedProperties": false
              },
              "stem_name": {
                "type": "string"
              }
            },
            "required": [
              "stem_name",
              "extracted_audio",
              "remaining_audio"
            ],
            "type": "object",
            "unevaluatedProperties": false
          },
          "type": "array"
        },
        "percussion_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "piano_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "strings_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "synth_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "vocal_url": {
          "type": "string",
          "x-runapi-generated-media": true
        },
        "woodwinds_url": {
          "type": "string",
          "x-runapi-generated-media": true
        }
      },
      "type": "object",
      "unevaluatedProperties": false
    },
    "status": {
      "enum": [
        "completed"
      ],
      "type": "string"
    }
  },
  "required": [
    "id",
    "status",
    "separated_audios"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "id": "tsk_reference_demo",
  "separated_audios": {
    "instrumental_url": "https://file.runapi.ai/reference-instrumental.mp3",
    "vocal_url": "https://file.runapi.ai/reference-vocals.mp3"
  },
  "status": "completed"
}
09

Customer callback: failed

HTTP 200

POST callback_url

Response schema
JSON 
{
  "properties": {
    "error": {
      "oneOf": [
        {
          "type": "string"
        },
        {
          "properties": {
            "code": {
              "type": "string"
            },
            "limit_cents": {
              "type": "integer"
            },
            "message": {
              "type": "string"
            },
            "reset_at": {
              "format": "date-time",
              "type": [
                "string",
                "null"
              ]
            },
            "used_cents": {
              "type": "integer"
            },
            "window": {
              "enum": [
                "1h",
                "1d",
                "7d",
                "daily",
                "weekly",
                "monthly",
                "lifetime"
              ],
              "type": "string"
            }
          },
          "required": [
            "code",
            "message"
          ],
          "type": "object",
          "unevaluatedProperties": false
        }
      ]
    },
    "id": {
      "type": "string"
    },
    "status": {
      "enum": [
        "failed"
      ],
      "type": "string"
    }
  },
  "required": [
    "id",
    "status",
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": {
    "code": "generation_failed",
    "message": "Task processing failed."
  },
  "id": "tsk_reference_demo",
  "status": "failed"
}
10

Errors

HTTP 401

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Authentication required"
}
11

Errors

HTTP 401

GET /api/v1/suno/separate_audio_stems/:id

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Authentication required"
}
12

Errors

HTTP 400

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "oneOf": [
    {
      "properties": {
        "error": {
          "description": "Human-readable error message.",
          "type": "string"
        }
      },
      "required": [
        "error"
      ],
      "type": "object",
      "unevaluatedProperties": false
    },
    {
      "properties": {
        "error": {
          "description": "Human-readable validation summary.",
          "type": "string"
        },
        "errors": {
          "additionalProperties": {
            "items": {
              "type": "string"
            },
            "type": "array"
          },
          "description": "Validation messages keyed by public request field, with an array of human-readable strings for each field.",
          "type": "object"
        }
      },
      "required": [
        "error",
        "errors"
      ],
      "type": "object",
      "unevaluatedProperties": false
    }
  ]
}

Response example

JSON 
{
  "error": "Validation failed",
  "errors": {
    "task_id": [
      "is required"
    ]
  }
}
13

Errors

HTTP 402

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Insufficient balance"
}
14

Errors

HTTP 429

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "API key credit limit exceeded"
}
15

Errors

HTTP 409

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "The request uses features that are not supported for the selected model"
}
16

Errors

HTTP 429

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Rate limit reached. Please retry later."
}
17

Errors

HTTP 503

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Service under maintenance, please try again later"
}
18

Errors

HTTP 504

POST /api/v1/suno/separate_audio_stems

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "The request timed out"
}
19

Errors

HTTP 404

GET /api/v1/suno/separate_audio_stems/:id

Response schema
JSON 
{
  "properties": {
    "error": {
      "description": "Human-readable error message.",
      "type": "string"
    }
  },
  "required": [
    "error"
  ],
  "type": "object",
  "unevaluatedProperties": false
}

Response example

JSON 
{
  "error": "Task with id 'tsk_reference_demo' not found"
}
20

Generated Code Samples

Use cURL directly, or install an SDK for your language. Each sample submits the validated request shown in this reference.

Install

Shell 
pip install runapi-suno
PYTHON 
import os
from runapi.suno import SunoClient

client = SunoClient(api_key=os.environ["RUNAPI_API_KEY"])
task = client.separate_audio_stems.create(
  task_id="tsk_source_music",
  audio_id="audio_reference",
  type="separate_vocal"
)