Kling AI launches version 4.0 with stereo audio and Flash variant

Kling AI has released version 4.0 of its video generator, adding stereo audio, multilingual lip sync, and a lighter Flash variant. The update increases video length to 30 seconds per generation and supports up to 10 keyframe images for scene control. A new "Creative Recreation" feature allows swapping products or characters in existing videos. The Flash variant tops out at 720p and 20 seconds. The company says individual elements like facial expressions and camera angles can be tweaked without affecting the rest of the clip.