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

# Wanx 2.5 I2V Preview

> [Core Function] Wanx 2.5 I2V Preview is an older generation image-to-video model. [Strengths] Maintained primarily for backward compatibility and stable API contracts. [Best For] Existing legacy integrations and workflows that strictly depend on this specific model version's quirks. [Limitations] Do NOT use this for new creations. It is a legacy model maintained for backward compatibility. [Routing] Only use if explicitly requested; otherwise use Wan 2.7 I2V.



## OpenAPI

````yaml /model-api/alibaba/alibaba-i2v.json post /alibaba/wan2.5-i2v-preview
openapi: 3.1.0
info:
  description: The image-to-video models API from Alibaba.
  version: 1.0.0
  contact:
    name: Modellix Support
    email: support@modellix.ai
  title: Alibaba Image-to-Video Models API
servers:
  - url: https://api.modellix.ai/api/v1
    description: The image-to-video models API from Alibaba.
security:
  - bearerAuth: []
paths:
  /alibaba/wan2.5-i2v-preview:
    post:
      summary: Wanx 2.5 I2V Preview
      description: >-
        [Core Function] Wanx 2.5 I2V Preview is an older generation
        image-to-video model. [Strengths] Maintained primarily for backward
        compatibility and stable API contracts. [Best For] Existing legacy
        integrations and workflows that strictly depend on this specific model
        version's quirks. [Limitations] Do NOT use this for new creations. It is
        a legacy model maintained for backward compatibility. [Routing] Only use
        if explicitly requested; otherwise use Wan 2.7 I2V.
      operationId: wan25I2vPreviewAsync
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Wan25I2vPreviewRequest'
      responses:
        '200':
          description: Task submitted successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncTaskResponse'
components:
  schemas:
    Wan25I2vPreviewRequest:
      type: object
      required:
        - img_url
      properties:
        prompt:
          type: string
          minLength: 1
          maxLength: 800
          description: Description of the desired output.
        img_url:
          type: string
          description: First frame image URL (supports HTTP/HTTPS/Base64)
          example: https://example.com/image.jpg
        negative_prompt:
          type: string
          maxLength: 500
          description: Description of what to avoid in the output.
        audio_url:
          type: string
          description: Audio file URL for audio-driven video generation
          minLength: 1
          example: https://example.com/audio.mp3
        resolution:
          type: string
          enum:
            - 480P
            - 720P
            - 1080P
          description: Output resolution of the generated content.
        duration:
          type: integer
          description: Video duration in seconds
          enum:
            - 5
            - 10
          default: 5
        prompt_extend:
          type: boolean
          default: false
          description: Whether to automatically extend/enhance the prompt.
        seed:
          type: integer
          minimum: 0
          maximum: 2147483647
          description: Random seed for reproducible generation. Use -1 for random.
    AsyncTaskResponse:
      type: object
      required:
        - code
        - message
        - data
      properties:
        code:
          type: integer
          description: Response code, 0 indicates success
          example: 0
        message:
          type: string
          description: Response message
          example: success
        data:
          type: object
          required:
            - status
            - task_id
            - model_id
          properties:
            status:
              type: string
              enum:
                - pending
                - processing
              description: Task status
              example: pending
            task_id:
              type: string
              description: Unique task identifier
              example: task-abc123
            model_id:
              type: string
              description: Model ID
              example: model-123
            get_result:
              type: object
              description: API information to query the task result
              properties:
                method:
                  type: string
                  description: HTTP method
                  example: GET
                url:
                  type: string
                  description: Full URL to query the task result
                  example: https://api.modellix.ai/api/v1/tasks/task-abc123
          description: Detailed data about the submitted asynchronous task.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.'

````