Seedance 2.5: fal's 30 s at 720p listing vs Sume's catalog limits

fal's model list describes Seedance 2.5 as a native 30-second clip at up to 720p. Sume's video docs list seedance-2.5 at 4 to 30 seconds and 480p, 720p or 1080p. Two pages, two descriptions: the first is a summary line on a listing, the second is the capability data Sume's catalog exposes.

Do not reconcile them by guessing. Ask the catalog you are about to call.

The two descriptions

As read on 2026-10-03.

Why they can differ

A listing line summarizes a model family and may describe one provider's configuration. Sume documents that limits are not uniform across its catalog and tells you to check the models endpoint before submitting. Neither page here is wrong on its face, and neither supports concluding which gateway is better. The only claim that matters for a build is what the endpoint you call accepts today.

Read the live limits

This script lists the video models Sume exposes and prints the fields that matter for a plan: id, supported resolutions and durations. Field names beyond supported_resolutions are read defensively, since the docs describe the catalog as the source of truth and the response can grow.

import os, requests

r = requests.get("https://api.sume.com/v1/videos/models",
                 headers={"Authorization": "Bearer " + os.environ["SUME_API_KEY"]},
                 timeout=60)
r.raise_for_status()
for m in r.json()["data"]:
    if "seedance" not in m["id"]:
        continue
    print(m["id"])
    print("  resolutions:", m.get("supported_resolutions"))
    print("  durations:  ", m.get("supported_durations"))

Using the result in a request

Once the catalog confirms a value, pin it in the request rather than leaving it to a default.

• Set model, resolution and the duration explicitly, within the range the catalog lists for that model.
• Use sume/auto when you want the router to choose, and pin a model id when a pipeline depends on a specific resolution.
• Re-read the catalog on a schedule. Models are retired, and the dates are on vendor pages.
• Treat any third-party listing, including fal's, as a pointer to go and check the catalog, not as the limit.