Overview

What is kling-4.ai?

kling-4.ai is an independent generation platform built around the Kling model series — we provide hosted access with our own generation pipeline, claimable free credits, and HTTP API documentation. We are not the official Kuaishou site.

Two ways to use the platform:

• The web generator. Open the generator, select a model and review its full quote. Kling 4.0 requires sign-in and paid credits; eligible free rewards apply only to other configurations within free-cost limits.
• The HTTP API. Approved API keys use the identifiers documented for that endpoint; website models are not automatically exposed there. Start with the API overview.

Generate your first video (browser)

1. Open the generator and describe your scene — subject, action, camera move, lighting. Something like "handheld close-up of a barista pouring latte art, warm morning window light, shallow depth of field" is plenty.
2. Optionally attach a reference image to lock a face, product, or location.
3. Review the displayed credit cost and select Continue to Create. The render stays in its Create conversation, where you can follow status, preview, and download it.

Eligible free rewards can cover lower-cost configurations on other models. Kling 4.0 is paid-only under current free-cost limits. For plan questions, contact us.

Generate your first video (API)

API key access is rolling out during v1. If you already have a key, call the API like this; if not, contact us and we'll enable access for your workspace:

curl -X POST 'https://kling-4.ai/api/ai-video/jobs' \
  -H 'x-api-key: YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "prompt": "A cinematic sunrise over a glass city, slow drone push-in",
    "parameters": { "duration": 5, "aspectRatio": "16:9" }
  }'

Generation is asynchronous: the call returns a job with status: "queued", and you poll GET /api/ai-video/jobs/{id} until it's completed. The full walkthrough lives in the API quick start.

Learn the craft

The specs get you started; prompt structure gets you good results. Our working notes are on the blog:

• Kling 4.0 Complete Guide — availability clarification and the currently supported model workflow.
• Multi-Shot Prompt Guide — prompts for current text, image and keyframe workflows.
• Kling 4.0 vs Seedance 2.5 — a verification checklist, not an unverified model benchmark.

Support

Something broken, or a question the docs don't answer? Reach us via the contact page and we'll get back to you.