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.
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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