Kling 4.0 extends single-pass AI video generation to 30 seconds

Kling 4.0 expands on Kling 3.0 by doubling single-pass video length from 15 to 30 seconds, supporting up to 10 keyframe images and a combined allowance of 15 reference assets. It also adds stereo audio, voice references and multilingual audio-visual synchronization.

• Single-pass length rises from 15 to 30 seconds
• Up to 10 keyframe images instead of start-and-end frames
• 15 reference assets: 10 images, 5 videos totaling 30 s, 7 subjects
• Stereo output, voice references and multilingual sync