Kling 4.0 Flash Image to Video API

Kling 4.0 Flash Image to Video is the entry-level, high-speed tier in the Kling 4.0 lineup from Kuaishou, built on the Kling 4.0 architecture. It animates a starting image into a native video clip of 3 to 20 seconds, optionally guided by a text prompt describing subject movement and camera motion. Every clip ships with native audio, including dual-channel stereo, and lip sync and dialogue are supported across Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French, and Hindi, with various accents and dialects. It also accepts text-to-video and Omni Reference inputs, and supports video editing from a prompt. The model is designed for high-volume, rapid content creation: drafting ideas, batching social media content, testing different hooks or concepts, and building product loops. It is a natural fit for image-to-video projects where the opening composition or product look matters, and for quick drafts before a final render on the full Kling 4.0 model. Single product shot prompts work well when the scene is kept focused rather than overloaded. Compared with the full Kling 4.0, Kling 4.0 Flash trades some advanced capabilities and higher resolution for speed and lower cost per clip. Output is fixed at 720p in 8-bit SDR, and it does not support end frames, multiple keyframes, 1080p, 4K, or 10-bit HDR. It ships with a subset of the full model's capabilities and is available on Morphic, Runware, and Runway, as well as through APIs such as Runware, with early access on some platforms.

Your bill depends on the provider you use, its prices and your usage. Longer inputs or other conditions may have different prices.

It supports text input, image input, and video input. For image-to-video, it animates a starting image with an optional text prompt describing subject movement and camera motion. It also accepts Omni Reference inputs, including reference images, reference videos, and subjects.

It generates native video clips of 3 to 20 seconds in length, with native audio included in every clip.

Every clip comes with native audio, including dual-channel stereo. It offers tighter lip sync and dialogue support in Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French, and Hindi, with various accents and dialects.

Output is fixed at 720p in 8-bit SDR. It does not support 1080p, 4K, or 10-bit HDR.

Kling 4.0 Flash is lighter and faster, trading some advanced capabilities and higher resolution for speed and lower cost per clip. It does not support end frames or multiple keyframes, which are reserved for the full Kling 4.0 model.