Kuaishou Kling 4.0 Flash
Kuaishou's faster, lower-cost Kling 4.0 tier: 720p clips of 3 to 20 seconds with native audio, from text, a first frame, reference images and videos, or a prompt that edits a source clip.
Kling 4.0 Flash is a cloud video-generation model built by Kuaishou. It produces short video clips from a text prompt or a starting image. It can also take reference video to guide the result. Clips run up to 20s with a synchronized audio track. It also supports reference images. It runs through Kling and Runware using your own API key, from about $0.094 per second of output.
- Released
- Nov 2026
- Pricing
- $0.094 per second
- Aspect ratios
- 16:9, 9:16, 1:1 +1 more
- Clip length
- Up to 20s
- Audio
- Synchronized track
- Image-to-video
- Start frame + reference images
Samples
Generated with Kling 4.0 Flash via Runware. The same two prompts run against every video model in the catalog (one landscape, one portrait), so the only thing that changes between two models’ clips is the model.
Camera motion, scene coherence over time
Fluid motion, fine detail, temporal stability
Kuaishou
Kuaishou builds the Kling family of cinematic video models — high-resolution clips with native audio, lip sync, and multi-shot storytelling.
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Kuaishou's unified video model: clips of up to 30 seconds at 1080p with native audio, from text, first and last frames, reference images and videos, or a prompt that edits a source clip.
Kuaishou's cinematic video model generating clips up to 1080p with native audio, lip sync, and sound effects from text or images.