Kling 2.1

Kling 2.1 is a video generation model developed by Kuaishou Technology, released in May 2025 as part of the Kling AI family. It generates videos up to 1080p resolution at 30 frames per second, with durations reaching up to two minutes — a significant leap from earlier versions that capped at 10 seconds.

The model uses a 3D spatiotemporal joint attention mechanism to accurately model complex movements. This architecture ensures that generated videos follow the laws of physics and exhibit natural motion, which is critical for scenes involving human movement, object interaction, or camera dynamics.

Kling 2.1 introduced Start and End Frame control, allowing creators to define both the opening and closing frames of a video sequence. This feature gives precise control over transitions and storytelling, making Kling 2.1 particularly useful for storyboard-to-video workflows where continuity matters.

Compared to Kling 1.6, the 2.1 release improved prompt adherence, temporal consistency, and detail rendering in faces and hands. While it has since been succeeded by faster and more capable versions in the Kling family, Kling 2.1 remains a solid option for creators who need longer video output with frame-level control.