Kling 4 or Vidu Q4 on Sume: model_not_found and what to call

If you send kling-4 or vidu-q4 to Sume today, expect a 404 model_not_found: those ids are not in the catalog. The closest rows that are listed are kling-3 (1080p, 4-15 s, first and end frame, no references) and, for long or budget text-to-video, wan-3.0 (2-30 s). sume/auto is the safe default when you only need a good clip and not a particular family.

Check before you submit

A cheap catalog check avoids a wasted job and a confusing error. The code below prints whether each id is listed; it only reads the catalog and does not create a job.

import os, requests

H = {"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"}
r = requests.get("https://api.sume.com/v1/videos/models", headers=H, timeout=30)
r.raise_for_status()
ids = {m["id"] for m in (r.json().get("data") or [])}
for want in ("kling-4", "vidu-q4", "kling-3"):
    print(want, "listed" if want in ids else "not listed")

What changes in your client?

Nothing, if the id comes from config. Keep the model id in an environment variable or setting, test it against GET /v1/videos/models at startup, and fall back to a listed id when it is missing. A fallback that silently changes family should be logged, because limits differ: kling-3 is always 1080p, wan-3.0 has three tiers, and Omni is 16:9 or 9:16 only.