Video

Kling 2.1 video

Kling 2.1 — image-to-video. 5s/10s. Pro tier adds optional end-frame and costs ~1.85x of Standard.

Category: Create · kling-2-1

How to use & limits

Image-to-video: requires prompt + start_image_url.
prompt: up to 5,000 characters.
Duration: 5 or 10 seconds.
quality standard or pro; the end frame (end_image_url) only works on pro.
Optional negative_prompt.

Capabilities

What this model supports, straight from the schema — no pricing, no infrastructure detail.

Capability	Value
`video_edit` Video edit	—
`start_frame` Start frame	Yes
`text_to_video` Text-to-video	—
`image_to_video` Image-to-video	Yes
`end_frame_pro_only` End frame (pro tier)	Yes
`reference_to_video` Reference-to-video	—

Parameters

Fields accepted in params (or first-class, where applicable) for POST /generations.

Name	Label	Type	Required	Default	Options	Min / Max	Description
`prompt`	Prompt	textarea	Required	—	—	—	Scene description; up to 5,000 characters.
`start_image_url`	Start frame	url	Required	—	—	—	First frame (required).
`end_image_url`	End frame	url	Optional	—	—	—	Optional end frame; only with quality=pro.
`negative_prompt`	Negative prompt	textarea	Optional	—	—	—	Terms to avoid in generation.
`duration`	Duration	select	Optional	5	—	—	Duration: 5 or 10 seconds (default 5).
`quality`	Quality	select	Optional	standard	standard · pro	—	Tier: standard or pro.

Example request

bash

curl -X POST https://caranguejo.art/api/v1/dev/generations \
  -H "Authorization: Bearer $CK" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling-2-1",
  "prompt": "The character turns to the camera and smiles, hair in the wind.",
  "params": {
    "duration": 5,
    "quality": "standard",
    "image_urls": [
      "https://media.caranguejo.art/inputs/example.png"
    ]
  }
}'

javascript

const res = await fetch("https://caranguejo.art/api/v1/dev/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer " + process.env.CK,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "kling-2-1",
    "prompt": "The character turns to the camera and smiles, hair in the wind.",
    "params": {
      "duration": 5,
      "quality": "standard",
      "image_urls": [
        "https://media.caranguejo.art/inputs/example.png"
      ]
    }
  }),
});
const { data } = await res.json();

Example response

json

{
  "id": "9f0c1a7e-…",
  "object": "generation",
  "model": "kling-2-1",
  "type": "video",
  "status": "completed",
  "output": {
    "assets": [
      {
        "url": "https://media.caranguejo.art/outputs/example.mp4",
        "type": "video"
      }
    ]
  }
}

The job's real cost is returned as credits_charged on the completed response — check GET /balance for the account balance.

Common errors for this job type:

`insufficient_credits`	Account balance can't cover the job cost.
`content_policy_violation`	Prompt or media rejected by content policy.
`generation_timeout`	The job exceeded the maximum processing time.
`rate_limited`	Too many requests per minute.
`invalid_input`	A required parameter is missing or outside the model's schema.
`generation_failed`	Generic processing failure.