Grok Imagine Video on Sume: the cents-per-job ladder, 4 to 15 seconds

Grok Imagine Video 1.5 is the cheapest video row in the Sume catalog: a flat provider list rate of $0.01 per second (pricing note dated 2026-06-29 in the repo), sold at list x 1.25, or $0.0125 per second. It works from a still image only, 4 to 15 seconds, at 480p or 720p.

Sume rounds each job up to the whole cent. At these amounts the rounding is visible, and it changes the effective per-second price by length.

The ladder

How to read it

A 4-second clip is exactly 5 cents and costs the least per second at 1.25 cents. A 5-second clip is $0.0625 exactly, so it rounds up to 7 cents, which is 1.40 cents per second. The worst case is any length where the exact price lands just over a whole cent. Between 4 and 15 seconds the effective rate stays between 1.25 and 1.40 cents per second, so the rounding never costs more than a small fraction of a cent per second on a single clip.

Nothing here changes with resolution: the catalog lists one flat rate for 480p and 720p, so choose 720p unless you need to save bandwidth. Output length follows duration, an integer between 4 and 15. There is no aspect ratio field; the clip takes its shape from the image you pass, so crop to 9:16 first for a vertical Short.

A batch

Fifty 6-second clips cost 50 x $0.08 = $4.00. At 1,000 clips of 6 seconds the bill is $80. Grok Imagine has no text-to-video and no audio in the Sume catalog, so if you need sound add it afterwards or pick another row.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"grok-imagine-video-1.5","prompt":"Gentle parallax, the lamp flickers","duration":6,"resolution":"720p","frame_images":[{"type":"image_url","image_url":{"url":"https://example.com/room.png"},"frame_type":"first_frame"}]}'