> ## 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 3.1 T2V > [Core Function] Veo 3.1 T2V is Google's state-of-the-art cinematic text-to-video engine. [Strengths] It natively generates 4K professional-grade video output with natively synchronized audio and supports complex camera movements. [Best For] Highly recommended for: high-end creative storytelling, cinematic short films, and experimental video production with sound. [Limitations] Do NOT use this model if you need instant/real-time generation, as 4K video rendering takes time. [Routing] Use this model by default for all high-quality text-to-video requests on the Google platform. ## OpenAPI ````yaml /model-api/google/google-t2v.json post /google/veo-3.1-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-3.1-t2v: post: summary: Veo 3.1 T2V description: >- [Core Function] Veo 3.1 T2V is Google's state-of-the-art cinematic text-to-video engine. [Strengths] It natively generates 4K professional-grade video output with natively synchronized audio and supports complex camera movements. [Best For] Highly recommended for: high-end creative storytelling, cinematic short films, and experimental video production with sound. [Limitations] Do NOT use this model if you need instant/real-time generation, as 4K video rendering takes time. [Routing] Use this model by default for all high-quality text-to-video requests on the Google platform. operationId: veo31T2VAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Veo31T2VRequest' examples: basic: summary: Basic video generation value: prompt: >- A majestic eagle soaring over snow-capped mountain peaks at sunrise advanced: summary: With duration and resolution value: prompt: >- Cinematic slow-motion shot of ocean waves crashing on rocky cliffs, golden hour aspectRatio: '16:9' duration: '8' resolution: 1080p personGeneration: allow_all with_negative_prompt: summary: With negative prompt value: prompt: The character walks through a magical glowing forest negativePrompt: blurry, low quality 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-t2v001 model_id: google/veo-3.1-t2v get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-t2v001 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: Veo31T2VRequest: type: object required: - prompt description: >- Veo 3.1 and Veo 3.1 Fast text-to-video request. Supports `prompt`, `negativePrompt`, `aspectRatio`, `duration`, `resolution` (up to 4k), and `personGeneration`. properties: prompt: type: string description: Video description text minLength: 1 example: A majestic eagle soaring over snow-capped mountain peaks at sunrise 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: '8' resolution: type: string description: >- Video resolution. Note: 1080p and 4k are only available for 8-second duration. enum: - 720p - 1080p - 4k example: 1080p 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`.' ````