Runway lists Seedance 2.5 with video input: what Sume accepts

Runway's API model guide lists seedance2_5 as taking text, image or video input. On Sume, seedance-2.5 accepts video as a reference through input_references (video and audio references are honored by the Seedance 2.x models), but it has no video_url edit mode. To edit an existing clip, Sume offers gemini-omni-flash-1.1 through the video_url field.

What each Sume model does with a video (read 2026-10-04)

The rows come from the Sume docs and video catalog.

Reference, not edit

A reference video guides motion or style. The model renders a new clip. Send it as reference_video_urls on the Video Router. If you need the original frames kept and one thing changed, the edit path is the one that does that.

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: seedance-ref-video-001" \
  -d '{
    "model": "seedance-2.5",
    "prompt": "Match the camera move of the reference, new subject: a red bicycle",
    "duration": 8,
    "resolution": "720p",
    "reference_video_urls": ["https://example.com/move.mp4"],
    "mode": "async"
  }'

Edit an existing clip

Edit mode lives on the Video Router. Send the source in video_url with Gemini Omni Flash 1.1, and no image_url or reference_*_urls in the same request. The prompt describes the edit, and aspect_ratio and duration are not accepted.

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: video-router-edit-001" \
  -d '{
    "model": "gemini-omni-flash-1.1",
    "prompt": "Make the sky overcast. Keep everything else the same.",
    "video_url": "https://example.com/source.mp4",
    "resolution": "720p",
    "mode": "async"
  }'

Inputs must be public

Media inputs must be public HTTPS URLs. Check supported_input_references and the Video Router capabilities for the model before you submit.