Kling 4.0 online: one model for text, frames, references, edit and extend
Kling 4.0 by Kuaishou: one model for text, frames (up to 10), photo/video/audio refs, edit and extend. 3–30 s, 720p or 1080p, always stereo.
from $0.227 $0.182/sec −20% per second of video · pay as you go · no subscription
What Kling 4.0 can do
Kling 4.0 is Kuaishou's flagship video model. One model instead of separate modes: clips from text, from the first and last frame plus mid keyframes (up to 10 images), from references (up to 10 photos, 5 videos, 3 audio clips), edit of an existing video, or extend from the last frame.
Duration 3 to 30 seconds, 720p or 1080p, aspects 16:9 · 9:16 · 1:1 · 21:9 or auto. Sound is always stereo: "auto" generates new audio, "origin" keeps your clip's sound. Pay per second; failed generations are refunded.
Use cases
- clips from a shot list or text
- editing a finished video with a prompt
- extending a scene from the last frame
- ads and Reels with stereo sound
How to get started
- Sign in with Telegram, GitHub or email — it takes half a minute.
- Open the Kling 4.0 page and write a prompt, optionally adding a photo.
- Check the price on the Create button and run it. The result appears on the page and in your Generations list.
- Top up when you need to — any amount, no subscription. Prefer code? Create an API key and call the same model over REST.
Prompt tips for Kling 4.0
- For keyframes upload the first and last frames; mid frames go in photos.
- When editing, describe only the change: "make it evening, add neon".
- Test 5 seconds in 720p, then render 1080p at the final length.
The more specific the prompt, the fewer attempts you need. Instead of "a nice picture", say what exactly, where, in what light and in what style.
Kling 4.0 FAQ
How much does Kling 4.0 cost?
You pay per second of finished video: from $0.182/sec. The exact amount for your settings is shown on the Create button before you start. No subscription — pay only for results.
Is there a Kling 4.0 free trial?
New accounts may get a small welcome bonus to try the models; after that you top up any amount you like and pay per generation. There is no monthly plan to cancel.
Is there a cheap Kling 4.0 API?
Yes. Every model on MixMedia, including Kling 4.0, is available through one REST API with the same pay-as-you-go prices as the website. Create a key in your dashboard and see the docs for examples.
How can I pay?
Top up your balance with a bank card from any country. Your balance never expires.
What if a generation fails?
If a task ends with an error, the charge is refunded to your balance automatically.