Kling 4.0 to generate AI videos up to 30 seconds long

Kuaishou's AI video model Kling is ready with a new generation. Kling 4.0 was announced on September 28, 2026, but the full release is planned for October 2026. No exact date has been given.

Initially, only a lighter version, Kling 4.0 Flash, is available. On September 28, 2026, Ultra Yearly subscribers received early access to it.

Longer clips and more control

According to the API platform fal.ai, which has described the model's features, Kling 4.0 can produce clips from 3 to 30 seconds. That doubles the previous maximum length. The information comes from a third party and not from Kling itself.

The model is said to support up to 10 keyframes. These are key images that guide the narrative or style of the video. The Omni Reference feature can take up to 15 references, namely 10 images and 5 videos, which the model can use as a model to work from.

Fal.ai also mentions two-channel stereo audio with improved lip sync, support for up to 4K and the new 21:9 aspect ratio. Eight languages are supported: English, Chinese, Japanese, Korean, Spanish, Portuguese, German and French.

Users can also edit existing footage with up to 5 input clips and a combined length of 30 seconds. That can mean changing expressions, movement, camera position, background or characters.

Flash is more limited

The Flash version is built for speed and frequent use. It is limited to 3-20 seconds, 720p and 8-bit SDR, and for image-to-video only the first frame is used. In other words, it does not match the full model's specifications.

Several features are also listed only as upcoming: 10-bit HDR in 1080p and 4K, as well as a feature that can extend video up to 2 minutes. They are not available at first.

Pricing and finances

The price of Kling 4.0 was not disclosed at launch.

Kling is a spun-off unit under Kuaishou. According to AI Weekly, citing Bloomberg, it was valued at around USD 18 billion in a funding round in July 2026, and an IPO attempt in Hong Kong is planned.