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POST
/
grok
/
v1
/
videos
/
generations
curl --request POST \
  --url https://api.cometapi.com/grok/v1/videos/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "A candle flickers on a wooden table."
}
'
{
  "request_id": "4b2cd27e-0b0d-3dec-c31c-7572daf74bb3"
}
Use this endpoint to start a Grok video job from text, or from text plus one source image. It returns a request_id immediately, so treat it as the first step in an async workflow.

​
Start with a small request

  • Use model: grok-imagine-video
  • For a first request, keep duration at 1 and resolution at 480p
  • Add image.url only when you want image-to-video
  • If you send base64, keep the docs and OpenAPI example form as data:image/png;base64,<BASE64_IMAGE_DATA>

​
Duration and resolution

SettingSupported valuesDefaultBoundary behavior
durationinteger 1-158Use shorter clips for first tests; longer clips cost more and take longer to complete.
resolution480p, 720p480p720p requests are billed at the higher resolution tier.
aspect_ratioratio labels such as 1:1, 16:9, or 9:161:1 in the examplesThis endpoint uses resolution plus aspect_ratio; do not send a separate size field for exact WxH control.
Request combinationIntended output WxH
resolution: 480p, aspect_ratio: 1:1480x480
resolution: 720p, aspect_ratio: 16:91280x720
resolution: 720p, aspect_ratio: 9:16720x1280

​
Task flow

1

Create the job

Send the prompt and save the returned request_id.
2

Poll for completion

Call Get Video Generation Results until the nested provider status becomes done.
3

Persist the output

Copy the final video.url into your own storage if you need it after the provider’s temporary delivery window.

Authorizations

​
Authorization
string
header
required

Bearer token authentication. Use your CometAPI key.

Body

application/json
​
prompt
string
required

Prompt for the video job.

Example:

"A candle flickers on a wooden table."

​
aspect_ratio
enum<string>

Output aspect ratio. Combine with resolution to choose the target frame; for example 480p with 1:1 targets 480x480, 720p with 16:9 targets 1280x720, and 720p with 9:16 targets 720x1280. This endpoint does not expose an exact size field.

Available options:
1:1,
16:9,
9:16,
4:3,
3:4,
3:2,
2:3
​
duration
integer
default:8

Output duration in seconds. Use an integer from 1 through 15. If omitted, CometAPI treats the request as an 8-second generation for billing and default handling.

​
image
object

Optional source image for image-to-video.

​
model
string
default:grok-imagine-video

xAI video model id.

Example:

"grok-imagine-video"

​
output
object
​
resolution
enum<string>
default:480p

Output resolution. Use 480p for faster first tests or 720p for the higher resolution tier.

Available options:
480p,
720p
​
size
string

Deprecated size field. Prefer aspect_ratio and resolution.

​
user
string

Optional end-user identifier.

Response

200 - application/json

Request accepted.

​
request_id
string
required

Deferred request id used for polling.