> ## 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 I2V > [Core Function] HappyHorse 1.1 I2V is Alibaba's latest streamlined first-frame image-to-video model. [Strengths] It turns a single image into high-quality 720P/1080P video with native audio support and 3-15 second duration; output aspect ratio follows the first frame image. [Best For] Highly recommended for: rapid image animation, product motion previews, and simple character or scene animation. [Limitations] It does not accept an explicit ratio parameter; use T2V or R2V when you need a fixed generated aspect ratio. [Routing] Prefer this model when the user provides one image and requests HappyHorse image animation. ## OpenAPI ````yaml /model-api/alibaba/alibaba-i2v.json post /alibaba/happyhorse-1.1-i2v openapi: 3.1.0 info: description: The image-to-video models API from Alibaba. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Alibaba Image-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The image-to-video models API from Alibaba. security: - bearerAuth: [] paths: /alibaba/happyhorse-1.1-i2v: post: summary: HappyHorse 1.1 I2V description: >- [Core Function] HappyHorse 1.1 I2V is Alibaba's latest streamlined first-frame image-to-video model. [Strengths] It turns a single image into high-quality 720P/1080P video with native audio support and 3-15 second duration; output aspect ratio follows the first frame image. [Best For] Highly recommended for: rapid image animation, product motion previews, and simple character or scene animation. [Limitations] It does not accept an explicit ratio parameter; use T2V or R2V when you need a fixed generated aspect ratio. [Routing] Prefer this model when the user provides one image and requests HappyHorse image animation. operationId: happyhorse11I2vAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Happyhorse11I2vRequest' examples: basic: summary: Basic video generation from image value: first_frame_image: https://example.com/first.jpg with_prompt: summary: With text prompt guidance value: first_frame_image: https://example.com/cat.jpg prompt: A cat running happily on a sunny meadow advanced: summary: Advanced with all parameters value: first_frame_image: https://example.com/first.jpg prompt: >- Smooth camera movement showing the scene from different angles resolution: 1080P duration: 5 seed: 12345 high_quality: summary: High quality 1080P with longer duration value: first_frame_image: https://example.com/landscape.jpg prompt: Slow pan across the beautiful landscape resolution: 1080P duration: 10 responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' components: schemas: Happyhorse11I2vRequest: type: object required: - first_frame_image properties: prompt: type: string description: >- Optional text prompt to guide video generation. Supports any language input. Maximum length: 5000 non-Chinese characters or 2500 Chinese characters (automatically truncated if exceeded) maxLength: 5000 first_frame_image: type: string description: >- First frame image URL. Supports HTTP/HTTPS URLs. Image requirements: Format: JPEG, JPG, PNG, WEBP; Resolution: Width and height >= 300 pixels; Aspect ratio: 1:2.5 ~ 2.5:1; File size: <= 10MB pattern: ^https?:// examples: - https://example.com/first.jpg resolution: type: string default: 1080P description: >- Video resolution level. The model automatically scales to the nearest total pixels based on the selected resolution. The output video aspect ratio approximately matches the input first frame enum: - 720P - 1080P duration: type: integer default: 5 description: Video duration in seconds. Must be an integer between 3 and 15 minimum: 3 maximum: 15 enum: - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 seed: type: integer description: >- Random seed for reproducibility. If not specified, the system generates a random seed. Note: Due to the probabilistic nature of model generation, even with the same seed, results may not be completely identical minimum: 0 maximum: 2147483647 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`.' ````