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Documentation Index

Fetch the complete documentation index at: https://docs.varg.ai/llms.txt

Use this file to discover all available pages before exploring further.

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Overview

Kling V3 is the recommended default video model. Made by Kuaishou, it offers the best balance of quality, flexibility, and cost. It supports continuous duration from 3-15 seconds (integer only) and both text-to-video and image-to-video generation.
Model IDTierCreditsDuration
kling-v3Pro1503-15s
kling-v3-standardStandard1003-15s
Both variants support first-frame and last-frame keyframe control via end_image_url.

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Quick start

import { createVarg } from "vargai/ai"

const varg = createVarg({ apiKey: process.env.VARG_API_KEY! })

const result = await varg.videoModel("kling-v3").generate({
  prompt: "cinematic shot of ocean waves crashing on rocky cliffs at golden hour",
  duration: 5,
  aspectRatio: "16:9",
})

console.log(result.video.url)

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Capabilities

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Text-to-video

const result = await varg.videoModel("kling-v3").generate({
  prompt: "a cat leaping gracefully from one rooftop to another, city skyline behind",
  duration: 8,
})

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Image-to-video

Animate a still image with a motion prompt: 
const result = await varg.videoModel("kling-v3").generate({
  prompt: "slow camera push-in, the subject blinks and smiles",
  imageUrl: "https://example.com/portrait.jpg",
  duration: 5,
})

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Keyframe control (first + last frame)

Provide two images to control the start and end frames of the video. The model interpolates the motion between them.
cURL
curl -X POST https://api.varg.ai/v1/video \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kling-v3",
    "prompt": "smooth transition from day to night",
    "duration": 5,
    "files": [
      { "url": "https://example.com/day-scene.jpg" },
      { "url": "https://example.com/night-scene.jpg" }
    ]
  }'
The first file becomes image_url (start frame) and the second becomes end_image_url (end frame).

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Parameters

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prompt
string
required
Text description of the video to generate. For image-to-video, describe the desired motion.
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duration
number
default:"5"
Video duration in seconds. Integer values from 3 to 15. No decimals — 5.5 will fail.
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aspect_ratio
string
default:"16:9"
Output aspect ratio. Common values: 16:9, 9:16, 1:1.
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files
array
Array of { url: string } objects. One image for image-to-video. Two images for first+last frame keyframe control.
Duration must be an integer. kling-v3 accepts 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15. Decimal values like 5.5 or out-of-range values will fail.

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Pricing

ModelCreditsUSD
kling-v3150$1.50
kling-v3-standard100$1.00
Standard tier is 33% cheaper with slightly lower quality. Good for drafts and iteration.

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Tips

  • Image-to-video is significantly better than text-to-video. Always generate a reference image first when possible.
  • Keyframe control is powerful for transitions — provide a start and end frame, and Kling interpolates the motion between them.
  • Keep prompts concise and motion-focused. Describe what moves and how, not static scene details (those belong in the reference image).
  • Standard tier (kling-v3-standard) is recommended for iteration and testing. Switch to pro for final renders.
  • Flexible duration is Kling V3’s advantage over other models that only support 5 or 10 seconds.

Seedance 2

ByteDance’s premium model. Excellent quality, supports video editing.

Sora 2

OpenAI’s video model with remix capability.

Wan 2.5

Budget alternative at 80 credits. Good motion quality.

Kling Legacy

Previous Kling versions (V2.6, V2.5, V2.1, V2).