Kling 4.0 Flash

• 🎬 Image-to-video tier of Kuaishou's fourth-generation Kling family
• ⚡ Speed-tuned Flash variant built for frequent, high-volume creation
• 📏 Clips up to 20 seconds, maximum 720p resolution
• 🔧 No start-and-last frames or multi-keyframe control in Flash
• 🆕 Kling 4.0 adds 21:9 ultrawide and better highlight/shadow retention
• 📚 Legible on-screen text across Chinese, English, Japanese, Korean and more
• 🎯 Strong for human motion, cinematic staging and editorial scenes
• 🏢 From Kuaishou, the Beijing-based short-video company behind Kwai

Kuaishou

Kuaishou Technology is a Chinese publicly traded company founded in 2011 by Hua Su and Cheng Yixiao, headquartered in Beijing's Haidian District and listed on the Hong Kong Stock Exchange. Originally known for its massively popular short-video platform —…

Kling 4.0 Flash (image-to-video) animates a still input into a short clip, and sits in the fast, lightweight tier of Kuaishou's fourth-generation Kling line. It shares its generation stack with the text-driven Kling 4.0 Flash, the multi-asset Kling 4.0 Flash R2V, and the clip-editing Kling 4.0 Flash Edit, all released the same day.

Relative to the full Kling 4.0 image-to-video model, Flash trades ceiling for turnaround: Kuaishou's own user guide positions it for rapid creative iteration and short-form work, supporting videos up to 20 seconds at a maximum of 720p, and notes it does not currently support start-and-last frames or multiple keyframes — for longer, higher-resolution output or precise frame control, the guide points users to the standard 4.0 model.

Against the earlier generation represented by Kling V3 Pro and Kling V3 Turbo Pro, Kuaishou describes the 4.0 generation as delivering more stable complex motion, stronger consistency across diverse references, and more coherent, controllable storytelling. The release notes also cite a stronger grasp of camera movement and shot sequencing, better highlight and shadow retention in backlit, night and neon scenes with reduced color banding, 21:9 ultrawide framing, and legible multilingual on-screen text that stays stable as the camera moves.

Practically, that makes this variant suited to batch social content, hook tests and motion drafts before committing to a longer, higher-resolution render.