Kling Review — Kuaishou's Commercial AI Video Model With Physics-Grade Motion, Camera Controls, and a Road to 4K

Kling (Kuaishou Technology, June 2024) is a closed-source commercial text-to-video and image-to-video model built on a Diffusion Transformer with a proprietary 3D VAE. It is China's most commercially successful AI video platform — reaching USD 240M ARR in December 2025 — and is known for physics-coherent motion (fluid, cloth, hair), Motion Brush trajectory controls, and a fast iteration cadence that delivered native 4K and synchronized audio by early 2026. Closed-source, subscription-based, with content filtering on politically sensitive topics. Rating: 4/5.