Kling AI Text-to-Video API

openapi: 3.0.3
info:
  title: Kling AI Open Platform Account Text-to-Video API
  description: 'The Kling AI Open Platform is the developer API for Kuaishou''s Kling generative video and image models. Every capability follows the same asynchronous pattern: submit a task with POST (receiving a task_id), then poll the matching GET endpoint by task_id until status is succeed and the generated video or image URLs are returned. Generated asset URLs are short-lived and should be downloaded promptly. Authentication uses a JWT (HS256) signed from an Access Key / Secret Key pair, passed as a Bearer token; tokens are short-lived (about 30 minutes).


    endpointsModeled: The overall path structure, async task model, JWT auth, and model catalog are grounded in Kling''s official Open Platform documentation and cross-referenced against multiple Kling API wrappers. Kling''s official reference pages block automated fetching (HTTP 446), so exact request/response field-level schemas here are honestly modeled on the documented behavior rather than copied verbatim, and should be reconciled against the live reference before code generation.'
  version: '1.0'
  contact:
    name: Kling AI Open Platform
    url: https://app.klingai.com/global/dev
servers:
- url: https://api.klingai.com
  description: Kling AI Open Platform (global)
security:
- bearerAuth: []
tags:
- name: Text-to-Video
  description: Generate video from a text prompt.
paths:
  /v1/videos/text2video:
    post:
      operationId: createTextToVideoTask
      tags:
      - Text-to-Video
      summary: Create a text-to-video task
      description: Submit a text prompt to generate a video. Returns a task_id to poll.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToVideoRequest'
      responses:
        '200':
          description: Task accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskCreatedResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
  /v1/videos/text2video/{task_id}:
    get:
      operationId: getTextToVideoTask
      tags:
      - Text-to-Video
      summary: Query a text-to-video task
      parameters:
      - $ref: '#/components/parameters/TaskId'
      responses:
        '200':
          description: Task status and, when complete, the generated video URL.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VideoTaskResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    VideoTaskResponse:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
        request_id:
          type: string
        data:
          type: object
          properties:
            task_id:
              type: string
            task_status:
              type: string
              enum:
              - submitted
              - processing
              - succeed
              - failed
            task_result:
              type: object
              properties:
                videos:
                  type: array
                  items:
                    type: object
                    properties:
                      id:
                        type: string
                      url:
                        type: string
                      duration:
                        type: string
    TextToVideoRequest:
      type: object
      required:
      - prompt
      properties:
        model_name:
          type: string
          description: Video model, e.g. kling-v1, kling-v1-6, kling-v2-master, kling-v2-1, kling-v2-5-turbo, kling-v2-6.
          example: kling-v2-6
        prompt:
          type: string
          description: Text description of the video to generate.
        negative_prompt:
          type: string
          description: Content to avoid.
        cfg_scale:
          type: number
          description: Prompt adherence strength, 0 to 1.
        mode:
          type: string
          enum:
          - std
          - pro
          description: Standard or professional generation mode.
        aspect_ratio:
          type: string
          enum:
          - '16:9'
          - '9:16'
          - '1:1'
          description: Output aspect ratio.
        duration:
          type: string
          enum:
          - '5'
          - '10'
          description: Video length in seconds.
        callback_url:
          type: string
          description: Optional URL notified when the task completes.
    TaskCreatedResponse:
      type: object
      properties:
        code:
          type: integer
          description: Business status code (0 indicates success).
        message:
          type: string
        request_id:
          type: string
        data:
          type: object
          properties:
            task_id:
              type: string
            task_status:
              type: string
              enum:
              - submitted
              - processing
              - succeed
              - failed
            created_at:
              type: integer
            updated_at:
              type: integer
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
        request_id:
          type: string
  responses:
    Unauthorized:
      description: Missing, invalid, or expired JWT.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    RateLimited:
      description: Too many requests or concurrency limit exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    TaskId:
      name: task_id
      in: path
      required: true
      schema:
        type: string
      description: The task identifier returned by the create-task call.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: 'A JWT signed with HS256 from your Access Key (as the iss claim) and Secret Key, passed as Authorization: Bearer <token>. Tokens are short-lived (about 30 minutes; nbf is typically set 5 seconds in the past).'