Kling 4.0 is an AI video generation and editing model designed for creating high-quality videos with improved realism, motion, audiovisual synchronization, and creative control. It supports text-to-video, image-to-video, first and last frame control, Omni Reference, and up to 10 keyframe images for directing important moments throughout a generation. Videos can range from 3 to 30 seconds and support resolutions up to 4K, 21:9 ultrawide output, and planned 10-bit HDR at 1080p and 4K. Kling 4.0 can combine as many as 15 reference assets, including images, videos, voice references, and subjects, to guide characters, actions, visual styles, camera movements, composition, and narrative pacing. The model also generates synchronized stereo audio, supports multiple languages and accents, and improves the stability of text, logos, and other visual elements as scenes and camera positions change.