> ## 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. # Kling V1.5 I2V > [Core Function] Kling V1.5 I2V is an older generation image-to-video model. [Strengths] Pioneered early realistic physics simulation in video generation. Maintained for backward compatibility. [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 Kling V3 I2V. ## OpenAPI ````yaml /model-api/kling/kling-i2v.json post /kling/kling-v1.5-i2v openapi: 3.1.0 info: description: The image-to-video models API from Kling AI. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Kling Image-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The image-to-video models API from Kling AI. security: - bearerAuth: [] paths: /kling/kling-v1.5-i2v: post: summary: Kling V1.5 I2V description: >- [Core Function] Kling V1.5 I2V is an older generation image-to-video model. [Strengths] Pioneered early realistic physics simulation in video generation. Maintained for backward compatibility. [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 Kling V3 I2V. operationId: klingV15I2VAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/KlingV15I2VRequest' examples: basic: summary: Basic parameters value: image: https://example.com/landscape.jpg prompt: Sweeping landscape view duration: 10 mode: pro responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' example: code: 0 message: success data: status: pending task_id: task-i2v002 model_id: model-123 get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-i2v002 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: KlingV15I2VRequest: type: object required: - image properties: prompt: type: string description: Video generation prompt minLength: 1 maxLength: 2500 example: Sweeping landscape view image: type: string description: Starting frame image URL or Base64 example: https://example.com/image.jpg image_tail: type: string description: >- Ending frame image URL or Base64 (mutually exclusive with motion brush and camera control) example: https://example.com/end.jpg negative_prompt: type: string description: Negative prompt minLength: 1 maxLength: 2500 example: blurry, static cfg_scale: type: number description: Prompt relevance (0.0-1.0). Only supported by V1 and V1.6. minimum: 0 maximum: 1 default: 0.5 example: 0.7 mode: type: string description: 'Generation mode: std or pro' default: std enum: - std - pro example: pro static_mask: type: string description: >- Static mask image for motion brush (mutually exclusive with image_tail) example: https://example.com/mask.jpg duration: type: integer description: Video duration in seconds default: 5 enum: - 5 - 10 example: 10 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. ErrorResponse: type: object required: - code - message properties: code: type: integer description: Error code (equals HTTP status code) example: 400 message: type: string description: Error message example: 'Invalid parameters: parameter ''image'' is required' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: parameter ''image'' is required' Unauthorized: description: Unauthorized - Invalid or missing API Key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 401 message: 'Authentication failed: invalid API key' TooManyRequests: description: Too many requests - Rate limit exceeded headers: X-RateLimit-Limit: description: Maximum requests per minute schema: type: integer example: 100 X-RateLimit-Remaining: description: Remaining quota in current window schema: type: integer example: 0 X-RateLimit-Reset: description: Rate limit window reset time (Unix timestamp) schema: type: integer example: 1704067260 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 429 message: >- Rate limit exceeded: 100 requests per minute, retry after 60 seconds InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 500 message: Internal server error securitySchemes: bearerAuth: type: http scheme: bearer description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.' ````