CassetteAI Music on Sume: a 90 s track bills 2 minutes

Yes: CassetteAI Music is on Sume as the Music Router id cassetteai-music. It takes duration_seconds from 10 to 180 (default 60) and bills per started minute, so a 90-second track is charged as two minutes and a 60-second track as one.

fal, which serves the model, lists "$0.02 per output minute" (read 2026-10-14) and returns a WAV file. Sume sells music engines at the fal list price times 1.25 and shows credits only.

Request

Pin the id and send the length. Without duration_seconds the row uses 60 seconds.

image_url is refused on this row; only Music Auto and the Lyria 3 rows take a picture.

curl -X POST https://api.sume.com/v1/music-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: cassette-90s-001" \
  -d '{
    "model": "cassetteai-music",
    "prompt": "Upbeat acoustic guitar loop, 100 BPM, instrumental",
    "duration_seconds": 90
  }'

Where started-minute billing bites

Started minutes round up. Ten seconds and sixty seconds cost the same; sixty-one seconds costs twice that. If a cut must land at 62 seconds, ask for 60 and extend on the Timeline rather than paying for a second minute you only use two seconds of.

The reverse also holds: if you were going to ask for 45 seconds, ask for 60 and trim, because the price is identical and you get a spare 15 seconds of handles.

Check the live rate before a batch

List prices move. The credits for this row are in GET /v1/music-router/models/cassetteai-music and on the API rate card; the Music Router docs hold the ranges. The fal numbers above are fal's, read on the date in the caption, and are not what a Sume account is charged.