sume/auto or a pinned model for 30-second video on Sume

Use a pinned model id for 30-second video. sume/auto has an Auto create range of 3 to 10 seconds with a default of 720p and 8 seconds, per the Video Router docs.

Auto is meant to hide the family choice; it never discloses which one ran. That makes it a good default for short clips and the wrong tool when you need 30 seconds or a specific model's behavior.

Side by side

Pinning

Pinning costs nothing extra in code: change the model string. The docs recommend /v1/videos for new work over the older Video Router path.

{"model": "wan-3.0", "prompt": "Product spin on a white table", "duration": 30}

What Auto does

Auto resolves from the normalized request and the catalog version, so an idempotent replay gets the same price and the same route. It never discloses the family, and the docs warn against inferring it from output traits.

That predictability is the strength; the limitation is length and control.

A routing habit that works

Use Auto for quick, short clips where any good model will do. Pin wan-3.0 for cheap long drafts and seedance-2.5 for the final long take.

Log the model alongside each job so you can compare cost and quality over time.

• Pinned: you control price per second.
• Auto: you save the decision.
• Both: same endpoint and polling flow.