Kling 4.0 · 720p
$0.1667 /sec
- Standard video generation
- 3–30 second output
Kling 4 API / Cinematic video generation with text, image, video, and audio references
Kling 4 is live on PiAPI. Generate 720p or 1080p video with Kling 4.0, or choose Kling 4.0 Flash for fast 720p generations.
Kling 4 API pricing
Pricing is calculated per second of generated output. Omni reference video can add billable input duration.
Kling 4.0 · 1080p
$0.25 /sec
- Pro video generation
- 3–30 second output
Kling 4.0 Flash · 720p
$0.10 /sec
- Flash video generation
- 3–20 second output
Ready to generate with Kling 4?
Kling 4 capabilities
A single asynchronous API for standard, Flash, and multimodal Kling 4 workflows.
Kling 4.0 and Flash
Choose Kling 4.0 for 720p or 1080p output, or Kling 4.0 Flash for fast 720p generation.
Flexible video entry
Use text-to-video, image-to-video, or multimodal references with explicit 3–30 second standard or 3–20 second Flash durations.
Multimodal Omni references
Standard Kling 4 Omni accepts up to 10 images, 5 videos, and 3 audio references in one task.
Predictable per-second pricing
Standard Kling 4 costs $0.1667/sec at 720p and $0.25/sec at 1080p; Flash costs $0.10/sec at 720p.
Compact result contract
Completed tasks expose the generated video at output.video, with one output per task.
API access
Create a task with model kling and version 4.0 or 4.0-flash, then poll it until completion.
Availability
Kling 4 is available now through the PiAPI API and Workspace Playground.
Generation
One output is returned per task in output.video.
Get started
Create your API key
Sign up and grab an API key from the PiAPI workspace — free credits are included on sign-up.
Top up credits
Add credits on the billing page when you are ready to scale beyond the free tier.
Call the API
POST your first task following the API docs, then poll the task until the result is ready.
Iterate in the playground
Prototype prompts and settings in the Open the Kling 4 Playground before wiring them into your product.
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "text_to_video",
"input": {
"version": "4.0",
"duration": 5,
"mode": "std",
"aspect_ratio": "16:9",
"prompt": "A tree moving gently in the wind"
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "image_to_video",
"input": {
"version": "4.0",
"duration": 5,
"mode": "std",
"aspect_ratio": "16:9",
"prompt": "The camera slowly moves toward the subject",
"image_url": "YOUR_IMAGE_URL"
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "video_generation",
"input": {
"version": "4.0",
"duration": 5,
"mode": "std",
"aspect_ratio": "16:9",
"prompt": "A smooth transition between the opening and closing frames",
"image_url": "YOUR_IMAGE_URL",
"image_tail_url": "YOUR_IMAGE_URL"
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "omni_video_generation",
"input": {
"version": "4.0",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9",
"enable_audio": true,
"prompt": "Use video_1 as the movement reference and image_1 as the scene",
"images": [
"YOUR_IMAGE_URL"
],
"videos": [
"YOUR_VIDEO_URL"
],
"audio_urls": [
"YOUR_AUDIO_URL"
]
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
- 4.0-std-720p-perSec: $0.1667 / video
- 4.0-pro-1080p-perSec: $0.25 / video
- 4.0-std-720p-refVideo-perSec: $0.10 / video
- 4.0-pro-1080p-refVideo-perSec: $0.15 / video
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "text_to_video",
"input": {
"version": "4.0-flash",
"duration": 5,
"mode": "std",
"aspect_ratio": "16:9",
"prompt": "A tree moving gently in the wind"
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "image_to_video",
"input": {
"version": "4.0-flash",
"duration": 5,
"mode": "std",
"aspect_ratio": "16:9",
"prompt": "The camera slowly moves toward the subject",
"image_url": "YOUR_IMAGE_URL"
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
Create a task
curl -X POST 'https://api.piapi.ai/api/v1/task' \
-H 'X-API-Key: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{
"model": "kling",
"task_type": "omni_video_generation",
"input": {
"version": "4.0-flash",
"duration": 5,
"resolution": "720p",
"aspect_ratio": "16:9",
"enable_audio": true,
"prompt": "Use video_1 as the movement reference and image_1 as the scene",
"images": [
"YOUR_IMAGE_URL"
],
"videos": [
"YOUR_VIDEO_URL"
]
}
}'Retrieve the result
curl 'https://api.piapi.ai/api/v1/task/{task_id}' \
-H 'X-API-Key: YOUR_API_KEY'video
Pricing
- 4.0-flash-720p-perSec: $0.10 / video
- 4.0-flash-720p-refVideo-perSec: $0.0667 / video
Kling 4 API FAQ
What is Kling 4?
Kling 4 is PiAPI's latest Kling video generation API. It supports text-to-video, image-to-video, and multimodal Omni references through one asynchronous task API.
How do I access Kling 4 through PiAPI?
Create a task with model kling and version 4.0 or 4.0-flash, then poll the task until it completes. The Kling 4 Playground and API quickstart use the same request contract.
How much does Kling 4 cost?
Kling 4.0 costs $0.1667 per second at 720p and $0.25 per second at 1080p. Kling 4.0 Flash costs $0.10 per second at 720p.
What duration and reference limits does Kling 4 support?
Kling 4.0 supports 3–30 second outputs and Kling 4.0 Flash supports 3–20 seconds. Standard Omni accepts up to 10 images, 5 videos, and 3 audio references.
What does a completed Kling 4 task return?
Completed Kling 4 tasks return the generated URL in output.video. Continue polling the task until status is completed or failed.
More questions? See the API docs.