Suno v6 retires earlier models: pin an engine id for ad music

Suno's v6 announcement says previous models are being retired as v6 rolls out (read 2026-10-07), so a prompt that gave you a bed last spring may not run on the same model next quarter. On Sume, reduce that risk by sending an explicit Music Router id such as lyria-3.5 instead of sume/music-auto, and by storing the finished audio file rather than the prompt.

What Suno changed

Suno launched v6 on 2026-09-09 as three models: v6 and the more experimental v6-wild for Pro and Premier subscribers, and v6-mini for everyone. The post lists editing a single section or lyric in plain language, mashups, sampling and isolating parts of a track, and text, audio, image and video inputs. It does not mention an API.

Why this matters for a recurring ad bed

A campaign often wants the same music across a refresh: a 15-second cut now, a 30-second cut in six weeks. If the model behind the prompt changes, the same words give a different track. Lyria on Sume is also single-turn with no seed, so even an unchanged model will vary between runs. The only repeatable asset is the file.

• Keep the audio artifact from the winning job. It is a Sume-hosted media.sume.com URL in result.artifacts[].
• Record job.request.routed_model next to it so you know which engine produced it.
• Pin the engine id in config. sume/music-auto selects Lyria 3.5 today, but that is a statement about today.

How to pin on Sume

Routable ids are sume/music-auto (default), lyria-3.5 and lyria-3-pro. Read them from GET /v1/music-router/models. All of them bill the same fixed Music price per accepted generation, so pinning costs nothing extra.

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: q4-bed-v1" \
  -d '{
    "model": "lyria-3.5",
    "prompt": "Upbeat acoustic pop, 112 BPM, G major. Claps and a bright ukulele. A 30-second track. Instrumental, no vocals."
  }'

What Sume does not do

Sume does not route to Suno, and its Music inputs are a text prompt of 1 to 5,000 characters plus an optional image URL. There is no section-edit call, so a changed chorus means a new generation with the revised brief. For the licensing questions that sit on top of this, read each vendor's terms before an ad ships.