Image-to-video API with sound: five-second cost by Sume row

Four Sume video rows turn a still into a clip that has sound: Gemini Omni Flash 1.1 (native synced audio, always on), Wan 3.0 (listed with audio), and MiniMax H3 and H3 Max (native stereo, no toggle). A 5-second clip costs between $0.19 and $0.94 on the rows in the table, depending on the row and resolution. Sume's Grok Imagine row is the cheap image-to-video option, but the catalog lists it without audio, so it is not in this table.

Sound-capable image-to-video rows at 5 seconds

Rates are the fal list times 1.25, from the Video Router catalog notes. 5-second totals below are unrounded; each job's final price is ceiled to the cent.

One request body

Omni accepts 16:9 and 9:16 only, 3 to 10 seconds. Wan 3.0 takes 2 to 30 seconds. H3 and H3 Max take 5 to 15 seconds and produce native 768p, which is not 720p. The first-frame request body is the same on all of them on /v1/videos:

{
  "model": "gemini-omni-flash-1.1",
  "prompt": "The kettle starts to boil, steam drifts left, kitchen ambience",
  "duration": 5,
  "resolution": "720p",
  "frame_images": [
    {
      "type": "image_url",
      "image_url": { "url": "https://example.com/kettle.jpg" },
      "frame_type": "first_frame"
    }
  ]
}

Muting

Do not send generate_audio: false to Omni or H3: those models always render sound, and Omni rejects the field. If you need a silent clip for your own music bed, pick a row whose catalog entry lists the toggle, or trim the audio afterwards.