# MiniMax Music 3 (music)

> MiniMax Music 3 writes and performs a song from a description and your lyrics. It returns the real duration it produced, which may be shorter than the length you asked for.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/music/minimax-music-3` is live. `POST /v1/generations` has no `music` type, so this endpoint is the only path to this model.

## Endpoint
POST https://api.roasos.com/v1/music/minimax-music-3
Auth: Authorization: Bearer roasos_sk_… (scope api:write). Idempotency-Key required. quote_only / quote_id / webhook_url as in https://docs.roasos.com/llms.txt.

## Good at
Score an ad with words you wrote. `lyrics` is required and is never written for you: putting words in your song is your decision, not the model's.

The price is $0.002 per second. `duration_seconds` is an UPPER BOUND, so the quote reserves the ceiling and settlement refunds whatever the model did not use. Ask for 60 seconds, get 41, and pay for 41. The settlement can only come down: a longer output settles at the ceiling you were quoted.

roasOS states no rights position on the music this model generates. Read the terms of the model and of fal before you publish a track.

## Pricing
Unit: second. Pricing key: `minimax-music-3`.

| request | credits |
|---|---|
| `30s` | 1 |
| `60s` | 2 |
| `240s` | 6 |

Credits come from the roasOS pricing table (`MODEL_COSTS`) through the catalog. No other field changes the price.

## Modes
- `text-to-music`
Provider endpoints: `minimax/music-3`.

## Request fields
| field | type | required | default | rule |
|---|---|---|---|---|
| `duration_seconds` | number | no | `60` | 1–300 |
| `lyrics` | string | yes | — | ≥ 1 character; ≤ 10,000 characters |
| `prompt` | string | yes | — | ≥ 1 character; ≤ 5,000 characters |
| `quote_id` | string | no | — | UUID |
| `quote_only` | boolean | no | `false` | — |
| `seed` | integer | no | — | -2147483648–2147483647 |
| `wait_timeout_seconds` | integer | no | `0` | 0–60 |
| `webhook_url` | string | no | — | https URL; ≤ 4,096 characters |

The schema is strict: a field that is not in this table returns `400 unsupported_option`. Field names are the roasOS role names, one name per role across every family.

## Media
The endpoint accepts no media. Every media role below is refused.
- Refused: `avatar_id`, `elements`, `product_id`, `product_images`, `references`, `reference_images`, `image_url`, `end_image_url`, `scene_id`, `scene_image`, `video_urls`, `video_url`, `audio_urls`, `audio_url`, `voice_id`. A refused role returns `400 unsupported_option`.
- Every URL must be an immutable object on `https://cdn.roasos.com/…` that your workspace owns; any other URL is `400 reference_media_not_workspace_owned`. Upload with `POST /v1/uploads` (direct POST of the bytes to `put_url`, or a `source_url` import), then use the returned CDN URL.

## Prompt
Write a structured caption in the prompt: genre, BPM, key, emotional arc, then the vocal details and a section-by-section arrangement.

In `lyrics`, put every structure tag on its own line — `[intro]`, `[verse]`, `[pre-chorus]`, `[chorus]`, `[bridge]`, `[outro]`. Text on the same line as a leading tag is dropped by the model.

## Not exposed
- `num_inference_steps`: not accepted by this public endpoint.
- `guidance_scale`: not accepted by this public endpoint.

## Result
Result kind `audio`. Always present: `url`. Present when the run produces it: `timestamps`.
```json
{ "data": { "id": "gen_…", "kind": "audio", "model": "minimax-music-3", "status": "completed", "result": {"timestamps":[{}],"url":"https://cdn.roasos.com/workspaces/ws_01/result"} } }
```
Files live on `https://cdn.roasos.com` and are immutable; a result URL can be a media input to the next call. Poll `GET /v1/jobs/{id}/status` → `{ id, status, updated_at }`, then `GET /v1/jobs/{id}/result` (`409 run_not_completed` until the job is `completed`, `failed` or `canceled`). Statuses: `queued → processing → completed | failed | canceled`.

## Example
```bash
# 1. quote — nothing is spent
curl -X POST https://api.roasos.com/v1/music/minimax-music-3 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-minimax-music-3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"lyrics":"[verse]\nTwo drops in the morning\n[chorus]\nThat is the whole routine","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# → 200 { "data": { "kind": "quote", "quote_id": "q_7Hk…", "credits": 1, "expires_at": "…", "confirmation": { "model": "minimax-music-3", "example": "30s" } } }

# 2. run — the same body and the same Idempotency-Key, quote_id instead of quote_only
curl -X POST https://api.roasos.com/v1/music/minimax-music-3 \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-minimax-music-3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk…","lyrics":"[verse]\nTwo drops in the morning\n[chorus]\nThat is the whole routine","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# → 201 { "data": { "id": "gen_…", "kind": "audio", "model": "minimax-music-3", "status": "queued", "credits_reserved": 1, "links": { "status": "/v1/jobs/gen_…/status", "result": "/v1/jobs/gen_…/result" } } }

# 3. poll
curl https://api.roasos.com/v1/jobs/gen_…/status -H "Authorization: Bearer roasos_sk_live_…"
curl https://api.roasos.com/v1/jobs/gen_…/result -H "Authorization: Bearer roasos_sk_live_…"
```

## Today
The endpoint is `POST /v1/music/minimax-music-3`.

It is live.

## See also
https://docs.roasos.com/models/music/minimax-music-3 · https://api.roasos.com/v1/catalog/music/minimax-music-3 · minimax/music-3