Gemini Omni Flash 1.1 reference-to-video: IMAGE_REF tags

A Gemini Omni Flash 1.1 reference-to-video request on Sume takes up to 10 reference_image_urls and up to 3 reference_video_urls, each video at most 3 seconds, and the prompt refers to them as <IMAGE_REF_0>, <VIDEO_REF_0> and so on, counted from 0 in list order.

That is the contract in Sume's Video Router docs, read 2026-10-06. The model also needs no audio reference: audio is generated natively and cannot be turned off.

How do I write the request?

Name the references in the prompt in the same order as the arrays.

curl -X POST https://api.sume.com/v1/video-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: omni-ref-001" \
  -d '{
    "model": "gemini-omni-flash-1.1",
    "prompt": "<IMAGE_REF_0> walks into frame and picks up <IMAGE_REF_1>",
    "reference_image_urls": ["https://example.com/a.png", "https://example.com/b.png"],
    "duration": 6,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "mode": "async"
  }'

What does it cost?

Reference inputs do not add a line item in the rate card; the price is output seconds by resolution.