Gemini Omni Flash 4K: clip length, upscaling and price

Yes. On Sume, gemini-omni-flash-1.1 takes resolution: "4K" for clips of 3 to 10 seconds in 16:9 or 9:16. Google's Omni page marks its 4k output as upscaled, so treat it as a delivery size, not a native 4K render. A 5-second 4K clip is reserved at $1.88.

Limits are from Sume's Video generation docs and Google's Omni page, read 2026-09-29; the price is computed from Sume's pricing code.

How long can a 4K clip be?

Between 3 and 10 seconds, the same range as the other Omni resolutions. Sume's docs do not shorten the range at 4K. That differs from Veo 3.1, which Google's Veo page describes as generating 8-second videos at 720p, 1080p or 4k; Sume does not list a Veo model.

Is 4K native or upscaled?

Google's resolution table says 720p is the default, and lists 1080p and 4k as upscaled output. If your delivery target is 4K, the extra pixels come from upscaling, so a 720p draft shows you the same composition at lower cost.

What does a 4K clip cost?

The 4K rate is $0.375 per second: Sume bills the provider list at × 1.25, reserved on submit, before any agent fee.

How do I request it?

Same request as any Omni clip, with 4K set.

curl -X POST "https://api.sume.com/v1/videos" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: omni-4k-001" \
  -d '{
    "model": "gemini-omni-flash-1.1",
    "prompt": "A slow push-in on a ceramic mug on a wooden desk, morning light",
    "resolution": "4K",
    "aspect_ratio": "16:9",
    "duration": 5
  }'

Should I draft at 720p first?

Usually. At 4K the second costs three times the 720p list rate in the pricing table, so a wrong prompt hurts more. Google names 720p the default resolution and marks 1080p and 4k as upscaled, which means a 720p draft shows the same composition and motion as the larger sizes.

A sensible order is a 720p test at 3 or 5 seconds, then one 4K render of the version you keep. Each render is a separate job, and Sume's docs say no v1 video model accepts seed, so the 4K result may differ from the draft in detail.

Which aspect ratios work at 4K?

Two: 16:9 and 9:16, the same as every other Omni resolution in Sume's docs. A vertical 4K clip is a 9:16 request with the same resolution value, and the price depends on seconds and resolution, not on the ratio. Other ratios, such as 1:1, are not listed for this model, so use another catalog model if you need a square frame.

Check GET /v1/videos/models for the current lists before you build on them, since the catalog can change.