Kwaivgi Kling V2.1 I2V Master

Playground

Kling 2.1 Master: The premium endpoint for Kling 2.1, designed for top-tier image-to-video generation with unparalleled motion fluidity, cinematic visuals, and exceptional prompt precision.

Features

Kling 2.1

Kling 2.1 is Kuaishou’s advanced image-to-video generation model released in 2025. Designed for high-fidelity cinematic output, Kling 2.1 transforms reference images — with optional text prompts — into visually rich, lifelike video clips.

🔧 Key Technology

3D Spatiotemporal Attention Architecture
Enables realistic motion and coherent visual progression across frames.
Real-World Physics Simulation
Produces natural, fluid, and intricate character movements and scene dynamics.

🎬 Core Features

Image-to-Video Transformation
Generates cinematic sequences from static images, optionally guided by user text.
AI-Assisted Prompting
Offers intelligent prompt suggestions to help users craft effective input instructions.
Multiple Video Variants
Capable of producing diverse outputs from the same prompt for greater creative flexibility.

🚀 Performance

Kling 2.1 marks a major leap over Kling 2.0 in:

Visual Realism
Motion Coherence
Prompt Adherence

In comparative evaluations, it rivals the quality of top-tier closed-source video generation models.

Kling 2.1 sets a new benchmark for generative video, blending artistry, physics, and AI precision.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result


# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/kwaivgi/kling-v2.1-i2v-master" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "prompt": "The scene opens with a small fishing boat caught in the midst of a raging storm. The sky is dark and ominous, filled with swirling clouds and flashes of lightning. The sea is tumultuous, with massive waves crashing against the boat, threatening to capsize it. The boat's deck is slick with rain, and the crew members are struggling to maintain control.",
    "negative_prompt": "blur, distort, and low quality",
    "image": "https://d3gnftk2yhz9lr.wavespeed.ai/media/images/1749522950129341275_kHvrnkgd.jpeg",
    "guidance_scale": 0.5,
    "duration": "5"
}'

# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"

Parameters

Task Submission Parameters

Request Parameters

Parameter	Type	Required	Default	Range	Description
prompt	string	Yes		-	Text prompt for generation; Positive text prompt; Cannot exceed 2500 characters.
negative_prompt	string	No		-	Negative text prompt; Cannot exceed 2500 characters.
image	string	Yes		-	First frame of the video; Supported image formats include.jpg/.jpeg/.png; The image file size cannot exceed 10MB, and the image resolution should not be less than 300*300px.
guidance_scale	number	No	0.5	0.00 ~ 1.00	The guidance scale to use for the generation.
duration	string	No	5	5, 10	The duration of the generated media in seconds.

Response Parameters

Parameter	Type	Description
code	integer	HTTP status code (e.g., 200 for success)
message	string	Status message (e.g., “success”)
data.id	string	Unique identifier for the prediction, Task Id
data.model	string	Model ID used for the prediction
data.outputs	array	Array of URLs to the generated content (empty when status is not `completed`)
data.urls	object	Object containing related API endpoints
data.urls.get	string	URL to retrieve the prediction result
data.has_nsfw_contents	array	Array of boolean values indicating NSFW detection for each output
data.status	string	Status of the task: `created`, `processing`, `completed`, or `failed`
data.created_at	string	ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”)
data.error	string	Error message (empty if no error occurred)
data.timings	object	Object containing timing details
data.timings.inference	integer	Inference time in milliseconds

Result Query Parameters

Result Request Parameters

Parameter	Type	Required	Default	Description
id	string	Yes	-	Task ID

Result Response Parameters

Parameter	Type	Description
code	integer	HTTP status code (e.g., 200 for success)
message	string	Status message (e.g., “success”)
data	object	The prediction data object containing all details
data.id	string	Unique identifier for the prediction, the ID of the prediction to get
data.model	string	Model ID used for the prediction
data.outputs	array	Array of URLs to the generated content (empty when status is not `completed`)
data.urls	object	Object containing related API endpoints
data.urls.get	string	URL to retrieve the prediction result
data.has_nsfw_contents	array	Array of boolean values indicating NSFW detection for each output
data.status	string	Status of the task: `created`, `processing`, `completed`, or `failed`
data.created_at	string	ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”)
data.error	string	Error message (empty if no error occurred)
data.timings	object	Object containing timing details
data.timings.inference	integer	Inference time in milliseconds

Kwaivgi Kling V2.0 T2v Master Kwaivgi Kling V2.1 I2v Pro