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POST
Veo 3.1 Fast 4K
veo3-1-fast-4k is the 4K Fast route for fixed 8-second video with synchronized native audio.
string
required
Set to veo3-1-fast-4k.
string
required
Describe the shot and intended audio.
string
required
Set to "8".
string
default:"16:9"
Use 16:9 or 9:16.
string[]
Optionally send one start frame or a start and end frame.

Request

Follow the Video API workflow and include model=veo3-1-fast-4k when polling and downloading.
The model ID fixes both duration and resolution. Send seconds: "8" and select only the aspect ratio.