Kling 4.0 Flash

• 🆕 Speed-tuned text-to-video tier of Kuaishou's fourth-generation Kling family
• 📏 Clips from 3 to 20 seconds, maximum 720p output
• ⚡ Built for rapid iteration and frequent, high-volume creation
• 🎯 No start-and-last frames or multi-keyframe control, unlike full Kling 4.0
• 👁️ 4.0 line adds 21:9 ultrawide and better highlight/shadow retention
• 📚 Kling 4.0 generates legible text across Chinese, English, Japanese, more
• 🔧 Sibling Flash variants cover image, reference and video-edit inputs
• 🏢 From Kuaishou, the Beijing short-video company behind Kling AI

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 is the speed-oriented tier of Kuaishou's fourth-generation Kling video model, and this entry is the text-to-video endpoint: a prompt in, a short cinematic clip out. Kuaishou positions it for frequent creation, pairing fast generation with what the company calls reliable quality, so ideas can be blocked out quickly before committing to a heavier render. It sits alongside Kling 4.0 Flash for first-frame animation, Kling 4.0 Flash R2V for reference-driven generation, and Kling 4.0 Flash Edit for editing existing clips.

Relative to the full Kling 4.0, Flash trades ceiling for turnaround: Kuaishou's user guide caps it at 20 seconds and 720p, and it does not support start-and-last frames or multiple keyframes, which remain reasons to choose the full model for longer, higher-resolution or tightly controlled shots.

As part of the 4.0 generation, it inherits the line's stated improvements over the 3.0 series, which includes models such as Kling V3 Turbo Pro and Kling V3 Pro. Kuaishou describes stronger understanding of camera movement and shot sequencing, more stable complex motion, legible on-screen text in Chinese, English, Japanese, Korean, Spanish and other languages that stays readable as the camera moves, better highlight and shadow retention in backlit, night and neon scenes, and support for 21:9 ultrawide framing.