Kling 4.0 is the latest video generation model from Kuaishou. On LubanAI it runs in the AI video generator: describe the scene in text, pick a length from 3 to 30 seconds, choose whether to include sound, and get an MP4 for product pages, ads and social media.

On LubanAI, Kling 4.0 generates videos at 720p / 1080p, 3–30 seconds long, in 16:9 / 9:16 / 1:1 aspect ratios. Audio is optional: turn it on to generate sound together with the picture. Each video downloads as an MP4 file.

You need a free LubanAI account and credits. Each Kling 4.0 generation uses credits, which you can add at any time through a subscription or a one-time credit pack whose credits never expire. No API key or separate account with the model developer is needed.

Video generation runs in the background and usually takes a few minutes, depending on the model, length and demand. You can close the page after you submit. When the video is ready, it appears in your task list, where you can view and download the MP4.

The credit amount depends on the resolution, length and audio setting, and is shown on the Generate button before you submit. If a video cannot be generated or delivered, the credits for that task return to your balance automatically.

Yes. Videos you create with this model can be used commercially, including on product pages, in ads and on short-video and social media platforms. No attribution is required on paid plans or credit packs; free-plan outputs require attribution to LubanAI. See our Terms of Service for details.

Videos can be downloaded for 30 days (7 days for free users). After that they are no longer available. Finished videos appear in your task list, where you can download each MP4 file. Download the videos you want to keep before they expire.

Choose Kling 4.0 for clips longer than 15 seconds, fast motion and stereo dialogue. Kling 3.0 costs fewer credits per second and is enough for short product clips, especially when you turn sound off.