Released in Sep 2026 by Kuaishou Kling, Kling 4.0 is a flagship AI video model. It natively generates up to 30s 4K 10-bit HDR videos, supports 10 narrative keyframes and multi-modal references to preserve characters and scenes. It comes with native stereo audio and multi-language lip sync. Kling 4.0 Flash is faster for bulk short-video drafts.