Use RunComfy's API to run kling/kling-v4/reference-to-video. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/kling/kling-v4/reference-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": ""
}'Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/kling/kling-v4/reference-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": ""
}'Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a queued job by request_id; in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"Provide a publicly reachable HTTPS URL. Ensure the host allows server-side fetches (no login/cookies required) and isn't rate-limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre-signed URLs for private assets.
{
"type": "object",
"title": "Input schema",
"required": [
"prompt"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "Describe the shot. Address reference images as @Image1, videos as @Video1, and subjects as @Element1.",
"type": "string",
"examples": [
"Use @Image1. She turns from profile toward the camera and gives a small closed-mouth smile. The studio light stays soft. Audio: quiet room tone and a faint cloth rustle, no music."
]
},
"image_urls": {
"title": "Image URLs",
"description": "Reference images, up to ten, addressed as @Image1 in list order. Opening, middle, and end frames count toward the same ten.",
"type": "array",
"maxItems": 10,
"items": {
"type": "string",
"format": "image_uri"
},
"examples": [
[
"https://playgrounds-storage-public.runcomfy.net/tools/7479/media-files/promo-input.webp"
]
]
},
"video_urls": {
"title": "Video URLs",
"description": "Reference videos, up to five, each 3-30 seconds, addressed as @Video1. Together with video subjects they stay within 30 seconds.",
"type": "array",
"maxItems": 5,
"items": {
"type": "string",
"format": "video_uri"
}
},
"start_image_url": {
"title": "Start Image",
"description": "Optional opening frame. Counts toward the ten-image total.",
"type": "string"
},
"middle_image_urls": {
"title": "Middle Images",
"description": "Optional ordered frames between open and close. Eight at most.",
"type": "array",
"maxItems": 8,
"items": {
"type": "string",
"format": "image_uri"
}
},
"end_image_url": {
"title": "End Image",
"description": "Optional last frame. Counts toward the ten-image total.",
"type": "string"
},
"elements": {
"title": "Elements",
"description": "Up to seven saved subjects. Each one is a front view plus optional angles, or a single 3-8 second video. At most three may be videos. Refer to them as @Element1, @Element2, and so on.",
"type": "array",
"items": {
"type": "object",
"properties": {
"frontal_image_url": {
"type": "string",
"format": "image_uri",
"description": "Front view of the subject. Use this with up to three extra angles, or use a video instead."
},
"reference_image_urls": {
"type": "array",
"format": "image_uris",
"maxItems": 3,
"items": {
"type": "string",
"format": "image_uri"
},
"description": "Up to three extra angles. Requires a front view, and cannot be combined with a video."
},
"video_url": {
"type": "string",
"format": "video_uri",
"description": "One 3-8 second clip of the subject, used instead of images. At most three elements may be videos."
}
}
},
"minItems": 0,
"maxItems": 7
},
"duration": {
"title": "Duration",
"description": "Clip length in whole seconds. The default is 5.",
"type": "integer",
"minimum": 3,
"maximum": 30,
"default": 5
},
"resolution": {
"title": "Resolution",
"description": "Output resolution. 1080p is the default. 720p is the lighter pass.",
"type": "string",
"enum": [
"720p",
"1080p"
],
"default": "1080p"
},
"aspect_ratio": {
"title": "Aspect Ratio",
"description": "Output frame. auto follows the references. 16:9 is the default.",
"type": "string",
"enum": [
"16:9",
"9:16",
"1:1",
"21:9",
"auto"
],
"default": "16:9"
}
}
}{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": {
"type": "string",
"format": "uri"
}
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": {
"type": "string",
"format": "uri"
}
}
}
}
}RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.