Use Kling V2.1 Pro through Rivya Public API v1 with model id kling-v2-1-pro, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIReadinessVideo

API model id

kling-v2-1-pro

Inputs

file

Files API

Required for reference modes

Base credits

per_video · 5s=50 · 10s=100 · ⌈total⌉

Capability

Video

Billing

FIXED

Prompt limit

5000 characters

Request contract

Send the model id at the top level. Model-specific controls belong in params.

Key	Type	Required	Default	Description
model	string	Yes	kling-v2-1-pro	Use the kling-v2-1-pro API model id.
prompt	string	Yes	-	Maximum 5000 characters for this model.
params	object	No	-	Model-specific parameter object. Use the rows below for allowed keys.
client_request_id	string	No	-	Optional client-side id for tracing requests in your system.

Model parameters

Key	Type	Required	Default	Range	Options	Description
duration	select	No	5	-	5, 10	Duration
negative_prompt	text	No	-	-	-	Negative prompt
cfg_scale	number	No	0.5	min 0 / max 1 / step 0.1	-	Controls how tightly the result follows your prompt. Higher values usually stay closer to the prompt, but can also make motion or composition feel stiffer.

Upload policy

Upload reference files first, then place the returned URL and duration token inside params.referenceMediaItems.

Reference rule

Reference images: Image mode accepts up to 2 image files, and the second image maps to the tail frame. JPEG/PNG ≤ 10 MB.

Max files

Accepted file kinds

image

Duration token

Video and audio references should carry durationToken from /api/v1/files when duration verification is required.

kind	Max size	MIME types
image	10 MB	image/jpeg, image/png

Minimal request

{
  "model": "kling-v2-1-pro",
  "params": {
    "duration": "5",
    "negative_prompt": "Describe what the video should avoid",
    "cfg_scale": 0.5
  }
}

Reference-file request

{
  "model": "kling-v2-1-pro",
  "params": {
    "duration": "5",
    "negative_prompt": "Describe what the video should avoid",
    "cfg_scale": 0.5,
    "referenceMediaItems": [
      {
        "url": "https://cdn.example.com/reference-image.png",
        "kind": "image",
        "name": "reference-image.png",
        "mimeType": "image/png"
      }
    ]
  }
}

Create response

The create endpoint returns a public task id. Poll the status endpoint until the task succeeds or fails.

{
  "id": "task_kling_v2_1_pro_example",
  "status": "queued",
  "model": "kling-v2-1-pro",
  "reserved_credits": 50,
  "final_credits": 0,
  "settlement_status": "RESERVED",
  "created_at": "2026-05-11T00:00:00.000Z",
  "updated_at": "2026-05-11T00:00:00.000Z",
  "result": null,
  "error": null
}

Common errors

validation_failed, insufficient_credits, idempotency_conflict, rate_limited, not_found

Some modes require Files API reference uploads.

Kling V2.1 Pro API Integration