> ## 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. # HappyHorse 1.1 T2V > [Core Function] HappyHorse 1.1 T2V is Alibaba's latest streamlined text-to-video model. [Strengths] It generates 720P/1080P video with native audio support, 3-15 second duration, and an expanded set of aspect ratios including 4:5, 5:4, 9:21, and 21:9. [Best For] Highly recommended for: fast HappyHorse text-to-video generation, social video formats, and high-throughput content creation. [Limitations] It does not expose custom audio controls; use Wan 2.7 T2V when custom audio input is required. [Routing] Prefer this model when the user explicitly requests HappyHorse text-to-video or wants the latest HappyHorse generation quality. ## OpenAPI ````yaml /model-api/alibaba/alibaba-t2v.json post /alibaba/happyhorse-1.1-t2v openapi: 3.1.0 info: description: The text-to-video models API from Alibaba. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Alibaba Text-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The text-to-video models API from Alibaba. security: - bearerAuth: [] paths: /alibaba/happyhorse-1.1-t2v: post: summary: HappyHorse 1.1 T2V description: >- [Core Function] HappyHorse 1.1 T2V is Alibaba's latest streamlined text-to-video model. [Strengths] It generates 720P/1080P video with native audio support, 3-15 second duration, and an expanded set of aspect ratios including 4:5, 5:4, 9:21, and 21:9. [Best For] Highly recommended for: fast HappyHorse text-to-video generation, social video formats, and high-throughput content creation. [Limitations] It does not expose custom audio controls; use Wan 2.7 T2V when custom audio input is required. [Routing] Prefer this model when the user explicitly requests HappyHorse text-to-video or wants the latest HappyHorse generation quality. operationId: happyhorse11T2vAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Happyhorse11T2vRequest' examples: basic: summary: Basic video generation value: prompt: >- A miniature city made of cardboard and bottle caps comes to life at night. advanced: summary: Advanced with all parameters value: prompt: >- A cardboard train slowly passes through a miniature city, illuminated by twinkling lights resolution: 1080P ratio: '16:9' duration: 5 seed: 12345 vertical_video: summary: Vertical video for mobile value: prompt: A beautiful sunset over the ocean resolution: 720P ratio: '9:16' duration: 10 square_video: summary: Square video value: prompt: A rotating 3D cube with colorful patterns resolution: 1080P ratio: '1:1' duration: 3 ultrawide_video: summary: Ultrawide video format value: prompt: A futuristic city skyline at night with flying vehicles resolution: 1080P ratio: '21:9' duration: 8 responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' components: schemas: Happyhorse11T2vRequest: type: object required: - prompt properties: prompt: type: string description: >- Text prompt describing the desired video content. Supports any language input, excess characters will be automatically truncated minLength: 1 maxLength: 5000 example: >- A miniature city made of cardboard and bottle caps comes to life at night. resolution: type: string description: Specifies the resolution tier for the generated video enum: - 720P - 1080P default: 1080P example: 720P ratio: type: string description: Specifies the aspect ratio for the generated video enum: - '16:9' - '9:16' - '1:1' - '4:3' - '3:4' - '4:5' - '5:4' - '9:21' - '21:9' default: '16:9' example: '16:9' duration: type: integer description: Specifies the video duration in seconds (integer) enum: - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 default: 5 example: 5 seed: type: integer description: >- Random number seed. To improve reproducibility of generated results, it is recommended to fix the seed value. Note: Due to the probabilistic nature of model generation, even using the same seed cannot guarantee completely identical results each time minimum: 0 maximum: 2147483647 example: 42 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. securitySchemes: bearerAuth: type: http scheme: bearer description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.' ````