> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Veo 3.1 Lite Text to Video

> Google Veo 3.1 Lite text to video model with fixed 8-second output

<Tip>
  1. Submit the request with `VIDGO_API_KEY`. After submission, a `task_id` is returned. If `callback_url` is provided, Vidgo sends the result after the task finishes or fails.
  2. You can always retrieve the result through the unified [Query Task Status](/api-manual/task-management/status) endpoint.
</Tip>

# Veo 3.1 Lite Text to Video

Generate an 8-second video with the Google Veo 3.1 Lite model.

## Available Models

* **veo3.1-lite/text-to-video** - Veo 3.1 Lite text to video generation

## Duration Options

* **8 seconds** - Fixed duration for this model.

## Key Features

* Generate directly from a text prompt without image input.
* Supports up to `4k` output resolution.
* Generated video URLs are temporary and should be downloaded promptly.

## Advanced Parameters

### Generation Type

* The model ID fixes generation to `text-to-video`; do not send a separate `generation_type` field.

### Resolution

* `720p` (default), `1080p`, or `4k`.

## Pricing

Pricing varies by model variant and resolution. Check the Vidgo dashboard for the current rate.


## OpenAPI

````yaml api-manual/video-series/veo3-1-lite-text-to-video.json POST /api/generate/submit
openapi: 3.0.0
info:
  title: Vidgo API - Veo 3.1 Lite Text to Video
  description: Veo 3.1 Lite Text to Video through the Vidgo unified generation API.
  version: 1.0.0
servers:
  - url: https://api.vidgo.ai
    description: Production server
security:
  - BearerAuth: []
paths:
  /api/generate/submit:
    post:
      tags:
        - Veo 3.1 Lite Text to Video
      summary: Submit Veo 3.1 Lite Text to Video Task
      operationId: submitVeo31LiteTextToVideoTask
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SubmitRequest'
            examples:
              default:
                summary: Veo 3.1 Lite Text to Video
                value:
                  model: veo3.1-lite/text-to-video
                  callback_url: https://your-domain.com/callback
                  input:
                    prompt: >-
                      A cinematic scene with natural lighting and coherent
                      motion
                    duration: 8
                    resolution: 720p
      responses:
        '200':
          description: Task submitted successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SubmitResponse'
        '400':
          description: Invalid request parameters
        '401':
          description: Unauthorized
components:
  schemas:
    SubmitRequest:
      type: object
      required:
        - model
        - input
      additionalProperties: false
      properties:
        model:
          type: string
          description: Vidgo public model identifier.
          enum:
            - veo3.1-lite/text-to-video
          example: veo3.1-lite/text-to-video
        callback_url:
          type: string
          format: uri
          description: Optional webhook callback URL.
        input:
          type: object
          required:
            - prompt
          additionalProperties: false
          properties:
            prompt:
              type: string
              description: Prompt describing the target video.
            duration:
              type: integer
              description: Veo 3.1 output duration is fixed at 8 seconds.
              enum:
                - 8
              default: 8
            aspect_ratio:
              type: string
              description: Output aspect ratio.
              enum:
                - '16:9'
                - '9:16'
            resolution:
              type: string
              description: Output resolution.
              enum:
                - 720p
                - 1080p
                - 4k
              default: 720p
    SubmitResponse:
      type: object
      required:
        - code
        - data
      properties:
        code:
          type: integer
          example: 200
        data:
          type: object
          required:
            - task_id
            - status
            - created_time
          properties:
            task_id:
              type: string
            status:
              type: string
              enum:
                - not_started
                - running
                - failed
            created_time:
              type: string
              format: date-time
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: 'Use `Authorization: Bearer VIDGO_API_KEY`.'

````