> ## Documentation Index > Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt > Use this file to discover all available pages before exploring further. # Happy Horse Text to Video > Create short scenes from text with Happy Horse, with output up to 1080p for landscape, portrait, and square video. 1. Submit the request with `VIDGO_API_KEY`. A `task_id` is returned immediately. Keep it until the task reaches `finished` or `failed`. 2. Use [Query Task Status](/api-manual/task-management/status) to retrieve the result. If you provide a `callback_url`, Vidgo sends the result to your [webhook](/api-manual/task-management/webhooks) when the task finishes or fails. # Happy Horse Text to Video Create short scenes from text with Happy Horse, with output up to 1080p for landscape, portrait, and square video. ## Available Models * **alibaba/happyhorse-1.0/text-to-video** - Generate video scenes from text prompts. ## Duration Options * **3-15 seconds** - Set `duration` as an integer. Default: **5 seconds**. ## Key Features * Generate video scenes from text prompts. * Choose from `720p`, `1080p` output resolutions. ## Advanced Parameters Set `model` and optional `callback_url` at the request root. Place the parameters below inside `input`. Send only the input fields supported by this workflow. Unsupported `input` fields are rejected before credits are deducted. Input URLs must use HTTP(S), include a hostname, and contain no embedded credentials. ### Prompt * `prompt`: Required. Describe the scene and desired motion. * The prompt must not be blank when supplied. Maximum length: **5,000 characters**. ### Resolution * `resolution`: `720p`, `1080p`. Default: `1080p`. ### Aspect Ratio * `aspect_ratio`: `16:9`, `9:16`, `1:1`, `4:3`, `3:4`. Default: `16:9`. ### Seed * `seed` is optional. Supply an integer from `0` to `2147483647`. ### Safety Checker * `enable_safety_checker` is optional. Set it to `true` or `false` to control safety checking. ## Pricing Pricing depends on the selected model and applicable output settings. Check the Vidgo dashboard for the current rate. Credits are deducted on submission and refunded if the task fails. ## OpenAPI ````yaml api-manual/video-series/alibaba-happyhorse-1-0-text-to-video.json POST /api/generate/submit openapi: 3.0.0 info: title: Vidgo API - Happy Horse Text to Video description: >- Create short scenes from text with Happy Horse, with output up to 1080p for landscape, portrait, and square video. version: 1.0.0 servers: - url: https://api.vidgo.ai security: - BearerAuth: [] paths: /api/generate/submit: post: tags: - Video Series summary: Happy Horse Text to Video description: >- Send only the fields shown for this workflow. Parameters from other workflows are rejected before credits are deducted. A nonblank prompt of at most 5,000 characters is required. Input URL fields require HTTP(S) URLs with a hostname and no embedded credentials. Credits are deducted on submission and refunded if the task fails. Reference prompts do not require character1 or character2 markers. operationId: submit_alibaba_happyhorse_1_0_text_to_video requestBody: required: true content: application/json: schema: type: object required: - model - input additionalProperties: true properties: model: type: string enum: - alibaba/happyhorse-1.0/text-to-video example: alibaba/happyhorse-1.0/text-to-video description: >- Vidgo public model ID. Must be `alibaba/happyhorse-1.0/text-to-video`. input: type: object properties: prompt: type: string maxLength: 5000 minLength: 1 description: >- Text prompt. Required. Maximum length is 5,000 characters. aspect_ratio: type: string enum: - '16:9' - '9:16' - '1:1' - '4:3' - '3:4' default: '16:9' description: Aspect ratio. resolution: type: string enum: - 720p - 1080p default: 1080p description: Resolution. duration: type: integer minimum: 3 maximum: 15 default: 5 description: Duration. seed: type: integer minimum: 0 maximum: 2147483647 description: Seed. enable_safety_checker: type: boolean description: Enable safety checker. additionalProperties: false required: - prompt callback_url: type: string nullable: true description: >- Optional public HTTP(S) endpoint for task completion notifications. HTTPS is recommended. Omit, use null, or use an empty string to disable callbacks. description: >- Keep model and callback_url at the root. Unknown root fields are ignored; unsupported input fields are rejected. examples: basic: summary: Basic workflow value: model: alibaba/happyhorse-1.0/text-to-video input: prompt: >- A quiet forest under soft morning light, with natural detail. aspect_ratio: '16:9' resolution: 1080p duration: 5 callback: summary: Receive a completion callback value: model: alibaba/happyhorse-1.0/text-to-video input: prompt: >- A quiet forest under soft morning light, with natural detail. aspect_ratio: '16:9' resolution: 1080p duration: 5 callback_url: https://your-domain.com/callback responses: '200': description: Task submitted content: application/json: schema: type: object required: - code - data properties: code: type: integer enum: - 200 data: type: object required: - task_id - status - created_time properties: task_id: type: string status: type: string enum: - not_started - running - finished - failed created_time: type: string format: date-time example: code: 200 data: task_id: task-unified-example status: running created_time: '2026-09-10T08:00:00' '400': description: >- Invalid input, unsupported tier, inaccessible media, or insufficient credits content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '401': description: Invalid credentials content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '403': description: Access denied content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '404': description: Unknown or disabled model content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '408': description: Request timed out content: text/plain: schema: type: string example: Request timeout '422': description: Invalid JSON or non-object request body content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '429': description: Rate or API key credit limit exceeded content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '500': description: Internal error content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '502': description: Unable to create the upstream generation task content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} '503': description: Model configuration or capability is not approved content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} components: securitySchemes: BearerAuth: type: http scheme: bearer description: Use VIDGO_API_KEY. ````