Animate a first image with Kuaishou Kling 4.0. Supply one image as the first frame and optionally a second as the last frame. Output framing follows the first image.
Property
Value
Public model ID
kling-4-i2v
Duration
Integer 3–30 seconds; default 5
Resolution
720p (default) or 1080p
Audio
Native stereo audio, always included
Framing
adaptive, from the first frame
Images
One first frame, optional second image as last frame
100 FreeModel credits = $1. The selected resolution and requested output seconds determine the reservation. References do not add input-video charges because this release accepts no video input. Confirm current rates on the Kling 4.0 model page.
One first-frame URL and optionally a second URL for the last frame. Use public
HTTP(S) PNG, JPEG or WebP files, at most 10 MiB each. Private, loopback and
credentialed URLs are rejected.
Native audio is mandatory. Only true is accepted; omitting it also includes
audio.
This release does not accept video_url, video_urls, audio_urls, intermediate keyframes, saved elements, editing or extension controls. It does not expose 4K or HDR. Text mode does not accept image inputs.
Keep polling an existing task after a client timeout. Repeated status checks do not create a new generation. Save the MP4 promptly and respect any returned expiry time. See the video workflow for task states and error handling.
Open Kling 4.0
Try the three modes in the Playground and compare live rates.
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