Use RunComfy's API to run kling/kling-video-o3/pro/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-video-o3/pro/reference-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "The woman in Figure 1 and the man in Figure 2 walk together along a rain-slick Tokyo street at night, slow cinematic tracking shot, neon reflections, shallow depth of field, photoreal detail."
}'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-video-o3/pro/reference-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "The woman in Figure 1 and the man in Figure 2 walk together along a rain-slick Tokyo street at night, slow cinematic tracking shot, neon reflections, shallow depth of field, photoreal detail."
}'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 scene, action, and camera. Refer to references by position, e.g. 'The woman in Figure 1 walks with the man in Figure 2 through a neon-lit alley.'",
"type": "string",
"default": "The woman in Figure 1 and the man in Figure 2 walk together along a rain-slick Tokyo street at night, slow cinematic tracking shot, neon reflections, shallow depth of field, photoreal detail."
},
"video": {
"title": "Reference Video URL",
"description": "Optional reference video for motion guidance, style transfer, or scene continuity. When provided, billing switches to the with-reference-video tier and overrides the sound multiplier.",
"type": "string"
},
"images": {
"title": "Reference Images",
"description": "Reference images of characters, props, or styles. Up to 7 without a reference video, or up to 4 when a reference video is provided.",
"type": "array",
"default": [
"https://playgrounds-storage-public.runcomfy.net/tools/7365/media-files/input-figure1.webp",
"https://playgrounds-storage-public.runcomfy.net/tools/7365/media-files/input-figure2.webp"
],
"maxItems": 7,
"minItems": 0
},
"keep_original_sound": {
"title": "Keep Original Sound",
"description": "When a reference video is provided, retain its original audio track in the generated output. Default: enabled.",
"type": "boolean",
"default": true
},
"sound": {
"title": "Generate Sound",
"description": "When enabled (and no reference video is provided), synthesize matching ambient audio and effects. Adds ~20% to the per-second cost. Default: disabled.",
"type": "boolean",
"default": false
},
"aspect_ratio": {
"title": "Aspect Ratio (W:H)",
"description": "Output frame ratio. 16:9 for landscape, 9:16 for vertical social, 1:1 for square. Default: 16:9.",
"type": "string",
"enum": [
"16:9",
"9:16",
"1:1"
],
"default": "16:9"
},
"duration": {
"title": "Duration (seconds)",
"description": "Length of the generated clip in seconds (3-15). Default: 5.",
"type": "integer",
"minimum": 3,
"maximum": 15,
"default": 5
},
"shot_type": {
"title": "Shot Type",
"description": "Editing scope. Use intelligent for auto-decided pacing and cuts, or customize for prompt-driven manual control. Default: intelligent.",
"type": "string",
"enum": [
"intelligent",
"customize"
],
"default": "customize"
},
"multi_prompt": {
"title": "Multi Prompt",
"description": "Additional prompt segments to guide scene transitions and progressions. The sum of durations in multi_prompt must equal to total video duration.",
"type": "array",
"items": {
"prompt": {
"title": "Prompt",
"description": "Additional prompt segment to guide a scene transition or progression.",
"type": "string",
"format": "str"
},
"duration": {
"title": "Duration",
"description": "Duration of the prompt segment in seconds.",
"type": "integer",
"format": "int_slider_with_range",
"minimum": 3,
"maximum": 15,
"default": 5
}
},
"maxItems": 20,
"minItems": 0
}
}
}{
"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.