HappyHorse 1.0 I2V: #1 Arena-Ranked Image-to-Video AI Model | RunComfy

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/happyhorse/happyhorse-1-0/image-to-video \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7345/media-files/ref-promo.webp",
    "prompt": "Slow cinematic camera drift around the subject, soft natural motion, identity-stable face and clothing, gentle wind moving hair, premium photoreal look."
  }'

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

{
  "type": "object",
  "title": "modelApiDoc_navInputSchema",
  "required": [
    "image_url",
    "prompt"
  ],
  "properties": {
    "image_url": {
      "title": "First Frame Image",
      "description": "Source image to animate (first frame). Formats: JPEG, JPG, PNG, or WEBP. Min 300px per side; aspect between 1:2.5 and 2.5:1; max 10MB.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7345/media-files/ref-promo.webp"
    },
    "prompt": {
      "title": "Prompt",
      "description": "Describe the motion, camera, lighting, and atmosphere. Up to 5000 non-Chinese characters or 2500 Chinese characters (longer input is truncated).",
      "type": "string",
      "default": "Slow cinematic camera drift around the subject, soft natural motion, identity-stable face and clothing, gentle wind moving hair, premium photoreal look.",
      "maxLength": 5000
    },
    "resolution": {
      "title": "Resolution",
      "description": "Output video resolution. HappyHorse 1.0 I2V supports 720P or 1080P.",
      "type": "string",
      "enum": [
        "720P",
        "1080P"
      ],
      "default": "1080P"
    },
    "duration": {
      "title": "Duration",
      "description": "Output video duration in seconds. Allowed values: 3–15.",
      "type": "integer",
      "enum": [
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15
      ],
      "default": 5
    },
    "seed": {
      "title": "Seed",
      "description": "Optional seed for reproducible generations. Use 0 to let the provider randomize.",
      "type": "integer",
      "minimum": 0,
      "maximum": 2147483647,
      "default": 0
    },
    "watermark": {
      "title": "Watermark",
      "description": "Whether to keep the provider watermark on the generated video.",
      "type": "boolean",
      "default": false
    }
  }
}