Assets

Try a sample
Optional. Supplying one turns this into image-to-video, starting from that frame. Mutually exclusive with the reference images below
Try a sample
Optional, pairs with the first frame; the model fills in the middle
Try a sample
Optional, up to 10, to pin down how a person or object looks. Mutually exclusive with the keyframes above — pick one mode

Prompt

Required. The 20000-character limit is the longest on the site — a full shot script fits in one go

Settings

Duration (seconds)
Any whole number from 2 to 30, billed per second. With the resolution tiers so close together, length is what drives the price
Resolution
Upstream defaults to 1080p, and an omitted value is billed as 1080p. 2K is about 1.11× and 4K about 1.28× — a small gap
Aspect ratio
Adaptive
This endpoint frames with ratio and has no size parameter. Adaptive follows the first frame
Generate audioOn by default upstream. Note that switching it off does not reduce the bill — only seconds and resolution count
Auto-expand promptOn by default. Turn it off once your prompt is already detailed
Seed
5s × 1080p
My generations0