---
title: "POST /grok/extensions"
method: POST
path: "/grok/extensions"
---

# POST /grok/extensions

`POST /grok/extensions`

Extend a video by generating continuation content. This is an asynchronous operation that returns a jobId for querying results.

## Request body

- ExtensionRequest
  - `prompt` string, required — Prompt describing what should happen next in the video.
  - `video` object, required — Video input object. Accepts a public URL, Base64-encoded data URL, or file_id. Maximum input video duration is 15 seconds.
    - `url` string — Public URL or base64-encoded data URL of the video.
  - `duration` integer — Duration of the extension segment to generate in seconds (1-10). Defaults to 6 seconds if not specified.
  - `model` 'grok-imagine-video' — Model to be used.

## Response `200`

Request successful

- object
  - `status` string, required
  - `message` string, required
  - `data` object, required

## Other responses

- `400` — Parameter error
- `401` — Authorization failed

---

[API](https://skmtc.net/ttapi/apis/flowmusic-api-docs.md) · [All operations](https://skmtc.net/ttapi/apis/flowmusic-api-docs/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/ttapi/flowmusic-api-docs/versions/f27f8a59dbd0/schema)