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

# Kling 2.1 API Documentation

> Kling 2.1 is an upgraded AI video model with smoother motion, better prompt accuracy, improved character realism, and enhanced visuals for more cinematic results. Learn how to integrate it here. 

Check out Kling 2.1 API pricing [here](https://api.pollo.ai/pricing?modelName=kling-v2-1\&modelType=video), cheaper than Fal AI.


## OpenAPI

````yaml POST /generation/kling-ai/kling-v2-1
openapi: 3.0.3
info:
  title: Pollo | AI Video Collection
  description: ✨RESTful API Document
  version: 1.0.0
servers:
  - url: https://pollo.ai/api/platform
security: []
externalDocs:
  url: https://pollo.ai/api/platform/api/openapi.json
paths:
  /generation/kling-ai/kling-v2-1:
    post:
      tags:
        - generation
        - video generation
      summary: create video by text or image or reference image
      operationId: generation-kling-v2-12video
      parameters: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                input:
                  type: object
                  properties:
                    image:
                      type: string
                      format: uri
                      description: >-
                        Only image URLs are accepted (HTTPS preferred); base64
                        is not allowed.
                                    Supported formats include JPG, PNG, and JPEG.
                                    Image aspect ratio must be less than 1:4 or 4:1.
                    imageTail:
                      type: string
                      format: uri
                      description: |-
                        URL of the tail image for video generation.
                                    Only image URLs are accepted (HTTPS preferred); base64 is not allowed.
                                    Supported formats include JPG, PNG, and JPEG.
                                    Image aspect ratio must be less than 1:4 or 4:1.
                    prompt:
                      type: string
                      maxLength: 2500
                      description: The prompt of the generation
                    negativePrompt:
                      type: string
                      maxLength: 2048
                      description: The negative prompt of the generation
                    strength:
                      type: number
                      minimum: 0
                      maximum: 100
                      default: 50
                      description: The prompt strength of the generation
                    length:
                      type: number
                      enum:
                        - 5
                        - 10
                      default: 5
                      description: The length of the generation
                    mode:
                      type: string
                      enum:
                        - std
                        - pro
                        - 4k
                      default: std
                  required:
                    - image
                  additionalProperties: false
                webhookUrl:
                  type: string
                clientSource:
                  type: string
                  minLength: 1
                  maxLength: 100
              required:
                - input
              additionalProperties: false
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                type: object
                properties:
                  taskId:
                    type: string
                  status:
                    type: string
                    enum:
                      - waiting
                      - succeed
                      - failed
                      - processing
                required:
                  - taskId
                  - status
                additionalProperties: false
        default:
          $ref: '#/components/responses/error'
      security:
        - ApiKeyAuth: []
components:
  responses:
    error:
      description: Error response
      content:
        application/json:
          schema:
            type: object
            properties:
              message:
                type: string
              code:
                type: string
              issues:
                type: array
                items:
                  type: object
                  properties:
                    message:
                      type: string
                  required:
                    - message
                  additionalProperties: false
            required:
              - message
              - code
            additionalProperties: false
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: API key to authorize requests

````