Omni video references: three clips of 3 s, so 9 s of footage at most

Gemini Omni Flash 1.1 on Sume accepts up to three reference videos, each no longer than three seconds, so you can hand it at most nine seconds of reference footage per request. You refer to them in the prompt as <VIDEO_REF_0>, <VIDEO_REF_1> and <VIDEO_REF_2>, numbered from zero in the order of the list.

The limits

These limits come from the Video Router docs and the catalog constraints for the model. Reference media is sent before the prompt, and the tag numbers follow the list order.

A request with two clips

The body below sends two reference clips and one image to POST /v1/video-router/generate. The prompt names each by its tag, so the model knows which asset you mean.

Trim long source footage to 3 seconds or less before you send it. If your clip is longer, cut a 3 s piece with the Video trim tool first; the Omni request does not accept a longer reference.

{
  "model": "gemini-omni-flash-1.1",
  "prompt": "Keep the motion of <VIDEO_REF_0>, and the mug from <IMAGE_REF_0>.",
  "reference_image_urls": ["https://example.com/mug.png"],
  "reference_video_urls": [
    "https://example.com/pan.mp4",
    "https://example.com/steam.mp4"
  ],
  "resolution": "720p",
  "duration": 6,
  "aspect_ratio": "9:16",
  "mode": "async"
}

Cost with references

Billing follows the output length and the resolution, not the number of references. The request above is a 6 s clip at 720p: 6 x 12.5 = 75 cents. The same 6 s clip without any reference is also 75 cents.

Native synced audio is always on, and Omni does not take reference audio, so a voice or a track has to be added after the render, for example in a Timeline.

The same length at every tier

For reference, a 6-second Omni Flash clip at each resolution. Every price is the seconds times the billable rate, rounded up to a whole cent, as of 2026-10-08.

Limits to remember

These apply to every request on this page, from the Video Router and Video generation docs:

• Length is 3 to 10 whole seconds in generation modes; an edit takes no duration.
• Aspect ratio is 16:9 or 9:16; an edit takes no aspect ratio.
• Native synced audio is always on, and generate_audio: false is rejected.
• There is no bitrate_mode, no reference audio and no seed.
• Billing is the provider list times 1.25 per output second, reserved at submit and shown in usage.cost.