Kling V2.1 I2V Standard

Kling 2.1 Standard is a cost-efficient endpoint for the Kling 2.1 model, delivering high-quality image-to-video generation

Features

Kling 2.1 is an advanced AI video generation model developed by Kuaishou, designed to deliver high-quality, realistic, and coherent video content from text and image prompts. It targets creators and professionals needing scalable, cinematic-grade video generation with strong motion consistency and rich visual detail.

Kling-v2.1-i2v-standard is cost-effective and suitable for rapid prototyping and rough drafts.

Key Features

Smooth Motion: Algorithmic stabilization for jitter-free long shots.
High-Fidelity Rendering: Physically accurate skin, fluid, and reflection modeling.
Prompt Understanding: Context-aware interpretation of actions/styles.
Camera Control: Cinematic techniques like dolly zoom and motion paths.

Use Cases

Short-Form Video Production (TikTok, Reels, YouTube Shorts).
Creative Storyboarding and Previsualization for film and advertising.
High-Quality Commercials and Promo Videos.
Artistic and Stylized Video Content for NFTs and experimental projects.
Game Development Previews and Virtual Environment Visualization.

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-standard" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "prompt": "In a sky filled with swirling clouds and patches of bright sunlight, a fighter jet pilot expertly performs high-speed maneuvers. As the pilot spots an incoming threat, they swiftly execute a barrel roll to evade it. The jet's engines roar as it slices through the air, leaving a trail of contrails behind. ",
    "negative_prompt": "blur, distort, and low quality",
    "image": "https://d2g64w682n9w0w.cloudfront.net/media/images/1749521540283047966_dqzyvrnl.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	In a sky filled with swirling clouds and patches of bright sunlight, a fighter jet pilot expertly performs high-speed maneuvers. As the pilot spots an incoming threat, they swiftly execute a barrel roll to evade it. The jet's engines roar as it slices through the air, leaving a trail of contrails behind.	-	Text prompt for generation; Positive text prompt; Cannot exceed 2500 characters
negative_prompt	string	No	blur, distort, and low quality	-	Negative text prompt; Cannot exceed 2500 characters
image	string	No	https://d2g64w682n9w0w.cloudfront.net/media/images/1749521540283047966_dqzyvrnl.jpeg	-	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	Flexibility in video generation; The higher the value, the lower the model’s degree of flexibility, and the stronger the relevance to the user’s prompt.
duration	string	No	5	5, 10	Generate video duration length 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
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

Kling V2.1 I2V Pro Minimax Video 01