Grok Imagine video price per second: xAI $0.05 and Sume's rate
xAI lists Imagine video from $0.05 per second. On Sume, grok-imagine-video-1.5 carries a list rate in code and bills at list x 1.25. The per-second math.
xAI's models page lists Imagine video as "Starting at $0.05 / sec" and Imagine image as "Starting at $0.02 / image". On Sume the Grok video model is grok-imagine-video-1.5: Sume's pricing table holds a list rate of $0.0100 per output second for it, and the docs say Sume bills list x 1.25, which is $0.0125 per second reserved at submit.
xAI's figure is a starting price on its own page and Sume's is a rate in Sume's pricing table, so the two are not the same measurement. Sume's code labels its rate as the genmedia (fal) price of $0.01 per output video second, well below xAI's "starting at" figure, so do not read the gap as a like-for-like discount. Vendor numbers are from xAI's page and Sume's from Video Router, read 2026-10-01.
What does a Grok clip cost per second on Sume?
The code rate is one flat number per output second. The Video Router page says Sume bills list x 1.25 on every model, so the estimate for a clip is seconds times $0.0125.
| Clip length | List | Reserved at list x 1.25 |
|---|---|---|
| 5 s | $0.05 | $0.0625 |
| 8 s | $0.08 | $0.1000 |
| 10 s | $0.10 | $0.1250 |
| 15 s | $0.15 | $0.1875 |
What does xAI say its page covers?
The xAI page puts Imagine Image 2.0 at 1K and 2K from $0.02 per image, and Grok Imagine Video 1.5 at 480p, 720p and 1080p from $0.05 per second. "Starting at" means the page prints a floor, so read the rate for your resolution in xAI's own docs before you budget.
Sume's image row for Grok is grok-image at a $0.02 list rate; see Grok image on Sume.
What does a Grok video request need on Sume?
Send model: "grok-imagine-video-1.5" to POST /v1/videos. The OpenAPI document says image_url is required for this model and end_image_url is not supported, so it is image-to-video with a start frame only. Reference handling is covered in Grok Imagine video 1.5 reference images.
How do I check the price before I submit?
Read pricing_skus for the model from GET /v1/video-router/models and treat the estimate as a reservation: it is held on submit and the job captures it on completion, with failed jobs releasing or refunding it. The Video generation docs describe the same billing line for every model.
Sources
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