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Suno chirp-v4
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Suno chirp-v4 API by SUNO

suno/chirp-v4
Chirp-v4

Suno text-to-music via APIMart: inspiration mode (custom=false) turns a description into a song; custom mode (custom=true) uses your own lyrics. Async; returns 2 tracks per generation.

Suno chirp-v4

Generate a full song — vocals or instrumental — from a text prompt, powered by Suno (version v4). Each generation returns 2 tracks plus cover art.

Two modes

modesetprompt means
Inspirationcustom: false (default)a description of the song: style, mood, genre, theme
Customcustom: truethe actual lyrics, e.g. [Verse] ... [Chorus] ...

In custom mode you can also set title, style, negative_tags, auto_lyrics, persona_id, style_weight, weirdness_constraint and audio_weight. Those fields are silently ignored in inspiration mode. vocal_gender and instrumental work in both.

Parameters

fieldrequirednotes
promptyesdescription (inspiration mode) or lyrics (custom mode), ≤3000 chars. Optional only when custom: true and instrumental: true
customnofalse = inspiration (default), true = your own lyrics
instrumentalnoinstrumental only, no vocals
vocal_gendernoMale / Female — both modes
titlenosong title — custom mode only
stylenostyle tags, e.g. synthwave, female vocal, cinematic — custom mode only
negative_tagsnostyles to avoid — custom mode only
auto_lyricsnolet the model rewrite your lyrics — custom mode only
style_weightno0.00–1.00 — custom mode only
weirdness_constraintno0.00–1.00 — custom mode only
audio_weightno0.00–1.00 — custom mode only
persona_idnovoice identity id — custom mode only

Output

outputs holds 2 audio URLs (two takes of the same request); the cover art is returned separately in thumbnail so it is never mixed into the audio list.

Notes

  • Async: submitting returns a request id; poll /api/v1/model/prediction/{request_id} until status is completed or failed. Generation typically takes 30–120s.
  • Billing: $0.12 per generation (both tracks included) — charged per request, not per track.

Example

Inspiration mode:

{ "model": "suno/chirp-v4", "prompt": "Late-night city lo-fi piano with the sound of rain" }

Custom mode with your own lyrics:

{ "model": "suno/chirp-v4", "custom": true, "prompt": "[Verse]\nNeon streets on a rainy night\n[Chorus]\nDrive on, drive on", "title": "Midnight Drive", "style": "synthwave, female vocal, cinematic", "vocal_gender": "Female" }

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