> ## 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. # C1 Text-to-Video > [Core Function] PixVerse c1 T2V generates a video purely from a text prompt, with no input image. [Strengths] Strong prompt adherence and smooth motion; optional audio. [Best For] Turning an idea or script into video, concept visualization, story beats, social clips from text. [Limitations] Do NOT use this when the user provides a starting image, two frames, or reference images; route to Image-to-Video, First-Last-Frame, or Reference-to-Video instead. c1 does not support multi-clip. [Routing] Use for text-only generation. The c1 variant takes the same inputs as v6 except it does not support multi-clip generation; choose c1-t2v when the user requests the c1 model and multi-clip is not needed. ## OpenAPI ````yaml /model-api/pixverse/pixverse-t2v.json post /pixverse/c1-t2v openapi: 3.1.0 info: description: >- The text-to-video models API from PixVerse. Generates videos purely from a text prompt. Tasks are asynchronous: submit, then poll the task endpoint for the result. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: PixVerse Text-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The text-to-video models API from PixVerse. security: - bearerAuth: [] paths: /pixverse/c1-t2v: post: summary: C1 Text-to-Video description: >- [Core Function] PixVerse c1 T2V generates a video purely from a text prompt, with no input image. [Strengths] Strong prompt adherence and smooth motion; optional audio. [Best For] Turning an idea or script into video, concept visualization, story beats, social clips from text. [Limitations] Do NOT use this when the user provides a starting image, two frames, or reference images; route to Image-to-Video, First-Last-Frame, or Reference-to-Video instead. c1 does not support multi-clip. [Routing] Use for text-only generation. The c1 variant takes the same inputs as v6 except it does not support multi-clip generation; choose c1-t2v when the user requests the c1 model and multi-clip is not needed. operationId: pixverseC1T2VAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/PixverseC1T2VRequest' examples: basic: summary: Prompt only value: prompt: A red fox running through a snowy forest at dawn, cinematic aspect_ratio: '16:9' duration: 5 quality: 720p 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-pixverse-t2v-002 model_id: pixverse/c1-t2v get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-pixverse-t2v-002 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: PixverseC1T2VRequest: type: object required: - prompt - aspect_ratio - duration - quality description: >- PixVerse c1 text-to-video request. Generates a video from a text prompt only. prompt/aspect_ratio/duration/quality are required (no default). c1 does not support multi-clip. properties: prompt: type: string minLength: 1 maxLength: 5000 description: Text description of the video to generate. example: A red fox running through a snowy forest at dawn, cinematic aspect_ratio: type: string enum: - '16:9' - '9:16' - '1:1' - '3:4' - '4:3' - '2:3' - '3:2' - '21:9' description: Video aspect ratio (required). example: '16:9' duration: type: integer minimum: 1 maximum: 15 description: Video duration in seconds (required). example: 5 quality: type: string enum: - 360p - 540p - 720p - 1080p description: Output resolution (required). example: 720p seed: type: integer minimum: 0 maximum: 2147483647 description: Random seed (omit for random). example: 0 generate_audio_switch: type: boolean default: false description: Whether to generate audio. example: false 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: pixverse/v6-t2v get_result: type: object description: API information to query the task result properties: method: type: string example: GET url: type: string 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 example: 400 message: type: string 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`.' ````