> ## 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 V2 Master T2V > [Core Function] Kling V2 Master T2V is an older generation text-to-video model. [Strengths] Offered improved multi-subject tracking and better texture details over V1. 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 T2V. ## OpenAPI ````yaml /model-api/kling/kling-t2v.json post /kling/kling-v2-master-t2v openapi: 3.1.0 info: description: The text-to-video models API from Kling AI. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Kling Text-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The text-to-video models API from Kling AI. security: - bearerAuth: [] paths: /kling/kling-v2-master-t2v: post: summary: Kling V2 Master T2V description: >- [Core Function] Kling V2 Master T2V is an older generation text-to-video model. [Strengths] Offered improved multi-subject tracking and better texture details over V1. 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 T2V. operationId: klingV2MasterT2VAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/KlingV2MasterT2VRequest' examples: basic: summary: Simple video generation value: prompt: Cherry blossoms falling in a Japanese garden detailed: summary: Detailed scene generation value: prompt: Underwater scene with colorful coral reef and tropical fish negative_prompt: murky water, poor visibility aspect_ratio: '1:1' duration: 5 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-ghi789 model_id: model-123 get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-ghi789 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: KlingV2MasterT2VRequest: type: object required: - prompt properties: prompt: type: string description: Video description text, supports Chinese and English minLength: 1 maxLength: 2500 example: Cherry blossoms falling in a Japanese garden negative_prompt: type: string description: Negative prompt describing undesired elements minLength: 1 maxLength: 2500 example: murky water, poor visibility mode: type: string description: 'Generation mode: std (standard) or pro (professional)' default: std enum: - std - pro example: pro aspect_ratio: type: string description: Video aspect ratio default: '16:9' enum: - '16:9' - '9:16' - '1:1' example: '1:1' duration: type: integer description: Video duration in seconds default: 5 enum: - 5 - 10 example: 5 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 in format ''Category: detail''' example: 'Invalid parameters: parameter ''prompt'' is required' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: parameter ''prompt'' 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`.' ````