Grok Imagine video 1.5: 1.25 cents a second at any resolution

grok-imagine-video-1.5 is the cheapest video id in the Sume catalog: $0.0125 per second, so $0.05 for the 4-second minimum, $0.075 for 6 seconds and $0.1875 for the 15-second maximum. The rate is flat: 480p and 720p are the same $0.0125 per second.

Clip and batch prices

It accepts 4 to 15 seconds at 480p or 720p. It is an image-to-video id: it needs a first-frame image, and it has no audio track and no aspect_ratio field.

Why drafts belong here

A 5-second draft on Grok is $0.0625. The same 5 seconds at 480p costs $1.34 on Seedance 2.5 and $0.3125 on Wan 3.0. If you are throwing away nine drafts out of ten, the cheap id pays for the whole exploration phase.

What it cannot tell you is how the same prompt behaves on another model. Drafts here check the idea (composition, motion, pacing); they do not predict another model's look.

Request

Send the still as the first frame. Resolution is optional; add it only to choose between 480p and 720p. The image URL here is a placeholder for your own public HTTPS image.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: grok-draft-001" \
  -d '{
    "model": "grok-imagine-video-1.5",
    "prompt": "Paper boats race down a rainy gutter",
    "frame_images": [{
      "type": "image_url",
      "image_url": {"url": "https://example.com/boats.png"},
      "frame_type": "first_frame"
    }],
    "duration": 6
  }'

Watching the bill

Because the rate is flat, resolution is a quality choice and not a cost lever on this id. A 15-second clip is $0.1875 at 480p and at 720p.

Sume reserves the estimated price at submit, so that amount must be free in the balance when you send the request. If it is not, the call fails with 402 insufficient_credits before any provider work starts.

Send an Idempotency-Key per clip. At this price a duplicate is cheap, but a thousand duplicates in a retry loop are not.