Kling O1: Cinematic Image-to-Video Playground & API | RunComfy
Kuaishou's Kling O1 transforms images into dynamic videos with support for start and end frames, offering industry-leading motion consistency and realism.
Table of contents
1. Get started
Use RunComfy's API to run kling/kling-video-o1/image-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-o1/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "The girl is walking on the street",
"start_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-1.png",
"end_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-2.png"
}'2. Authentication
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.
3. API reference
Submit a request
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-o1/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "The girl is walking on the street",
"start_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-1.png",
"end_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-2.png"
}'Monitor request status
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 request results
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 request
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>"4. File inputs
Hosted file (URL)
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.
5. Schema
Input schema
{
"type": "object",
"title": "Input",
"required": [
"prompt",
"start_image_url",
"end_image_url"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "Use @Image1 to reference the start frame, @Image2 to reference the end frame.",
"type": "string",
"default": "The girl is walking on the street"
},
"start_image_url": {
"title": "Start Image",
"description": "Image to use as the first frame of the video. Accepted file types: jpg, jpeg, png, webp, gif, avif.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-1.png",
"validations": [
{
"validation_rule": "file_size_mb<",
"validation_value": 10,
"validation_error": "File size must be less than 10 MB."
},
{
"validation_rule": "width_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must exceed 300 pixels."
},
{
"validation_rule": "height_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must exceed 300 pixels."
},
{
"validation_rule": "width/height>",
"validation_value": 0.4,
"validation_error": "The aspect ratio range should be between 0.40 and 2.50."
},
{
"validation_rule": "width/height<",
"validation_value": 2.5,
"validation_error": "The aspect ratio range should be between 0.40 and 2.50."
}
]
},
"end_image_url": {
"title": "End Image",
"description": "Image to use as the last frame of the video. Accepted file types: jpg, jpeg, png, webp, gif, avif.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7243/media-files/input-1-2.png",
"validations": [
{
"validation_rule": "file_size_mb<",
"validation_value": 10,
"validation_error": "File size must be less than 10 MB."
},
{
"validation_rule": "width_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must exceed 300 pixels."
},
{
"validation_rule": "height_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must exceed 300 pixels."
},
{
"validation_rule": "width/height>",
"validation_value": 0.4,
"validation_error": "The aspect ratio range should be between 0.40 and 2.50."
},
{
"validation_rule": "width/height<",
"validation_value": 2.5,
"validation_error": "The aspect ratio range should be between 0.40 and 2.50."
}
]
},
"duration": {
"title": "Duration",
"description": "Video duration in seconds.",
"type": "integer",
"enum": [
5,
10
],
"default": 5
}
}
}Output schema
{
"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.