sume/auto with no model field: 8 s at 720p is $1.00

A POST /v1/videos request with model: "sume/auto" and nothing else resolves to Gemini Omni Flash 1.1 at 720p for 8 seconds, which costs $1.00 on Sume ($0.125 per second x 8). Native audio is always on. Add the 5.5% platform fee from Sume's pricing policy and it is about $1.06.

sume/auto has no price of its own. Billing uses the family it resolves to, and the job echoes sume/auto as the model. Because the resolver is a pure function of the request and the catalog version, the same request gets the same route and the same price on replay.

Default resolution and length

For text, first-frame, first-and-last-frame and reference requests the target is gemini-omni-flash-1.1. It supports 3 to 10 seconds, 360p, 720p, 1080p and 4K, 16:9 or 9:16, and defaults to 720p and 8 seconds. Requests outside that envelope (generate_audio: false, 2 or 11 seconds, 480p or 768p) fail with a 400 unsupported_capability before any provider is called, so you are not billed for them.

The arithmetic

The provider list on fal is $0.03, $0.10, $0.15 and $0.30 per second at 360p, 720p, 1080p and 4K. Sume multiplies each by 1.25: $0.0375, $0.125, $0.1875 and $0.375. The default clip is 8 x $0.125 = $1.00. A 10-second 4K clip is 10 x $0.375 = $3.75, a 3-second 360p clip is $0.1125.

Three default clips are $3.00, which is the arithmetic behind a 24-second reel in three jobs. With the platform fee, a hundred default clips is $100.00 x 1.055 = $105.50.

Steps

• If you need a cap, send duration and resolution explicitly; the defaults are only what you get when you omit them.
• For a vertical post, send aspect_ratio: "9:16", which does not change the price.
• Read usage.cost on the finished job; it is the billed amount for the resolved family.
• If you pin a named model, you leave the auto rules and the model's own envelope applies.

Cost of changing one field

Each field you set moves the price in a way you can compute before sending. Moving the default clip from 720p to 1080p changes 8 x $0.125 = $1.00 into 8 x $0.1875 = $1.50, a 50% rise. Going to 4K gives 8 x $0.375 = $3.00, three times the default. Dropping to 360p gives 8 x $0.0375 = $0.30, less than a third.

Length is linear: each second at 720p adds $0.125, so 5 seconds is $0.625 and 10 seconds is $1.25. If a dashboard shows cents, expect $0.63 and $1.25. Stay with the default for exploration, then pin resolution and length for finals so the cost per clip is a number you chose rather than a default.

What Sume does not do

sume/auto does not expose which family it chose in public bodies or errors, does not load balance or A/B test, and does not silently route a request it cannot satisfy to Seedance. Only a video_url edit request can send GLM to select another capable family, and a failure there falls back to Omni 1.1. Read from the repo and docs on 2026-10-08.