> ## 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. # Veo 3 Fast T2V > [Core Function] Veo 3 Fast T2V is an older generation text-to-video model. [Strengths] Provided strong physical consistency and 1080p generation capabilities before the 3.1 update. Maintained for backward compatibility. [Best For] Existing legacy integrations that require the specific speed/cost tradeoff of this older model. [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 Veo 3.1 T2V. ## OpenAPI ````yaml /model-api/google/google-t2v.json post /google/veo-3-fast-t2v openapi: 3.1.0 info: description: The text-to-video models API from Google (Veo series). version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Google Text-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The text-to-video models API from Google. security: - bearerAuth: [] paths: /google/veo-3-fast-t2v: post: summary: Veo 3 Fast T2V description: >- [Core Function] Veo 3 Fast T2V is an older generation text-to-video model. [Strengths] Provided strong physical consistency and 1080p generation capabilities before the 3.1 update. Maintained for backward compatibility. [Best For] Existing legacy integrations that require the specific speed/cost tradeoff of this older model. [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 Veo 3.1 T2V. operationId: veo3FastT2VAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Veo3T2VRequest' examples: urban: summary: Urban scene value: prompt: >- Busy city intersection at rush hour with people crossing, warm afternoon light landscape: summary: Landscape with duration value: prompt: Abstract flowing liquid metal with colorful reflections aspectRatio: '16:9' duration: '4' 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-t2v004 model_id: google/veo-3-fast-t2v get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-t2v004 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: Veo3T2VRequest: type: object required: - prompt description: >- Veo 3 and Veo 3 Fast text-to-video request. Supports `prompt`, `negativePrompt`, `aspectRatio`, `duration`, `resolution` (720p/1080p), and `personGeneration`. properties: prompt: type: string description: Video description text minLength: 1 example: Northern lights dancing across an arctic sky above a frozen lake negativePrompt: type: string description: Text describing what to avoid in the generated video. example: blurry, low quality, distorted aspectRatio: type: string description: Video aspect ratio default: '16:9' enum: - '16:9' - '9:16' example: '16:9' duration: type: string description: Video duration in seconds (string type) enum: - '4' - '6' - '8' example: '6' resolution: type: string description: Video resolution enum: - 720p - 1080p example: 720p personGeneration: type: string description: Person generation policy enum: - allow_all example: allow_all 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 for polling example: task-abc123 model_id: type: string description: Model ID in `provider/model` format example: google/veo-3.1-t2v 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`.' ````