How many frames can I use?

A first frame, up to 8 middle keyframes and a last frame, capped by duration: 3s allows 4 frames in total, 5s allows 6, 8s allows 9, and 9s or longer allows 10.

Is the first frame required?

Yes, whenever keyframe_urls or last_frame_url is set.

What aspect ratio does the output use?

It follows the first frame. aspect_ratio only applies when no frame is provided.

How is pricing calculated?

Per second of output video: $0.157/s at 720p and $0.235/s at 1080p. With reference videos or video elements the rate is $0.094/s (720p) or $0.141/s (1080p), billed on the reference-video seconds plus the output seconds, with a minimum of 2x the output length.

How do I get the result?

The endpoint is asynchronous. Poll /api/v1/predictions/{request_id}/result or pass a webhook_url to be notified when the video is ready.

Back to Comparison Hub/Kling 4.0 Keyframe to Video API Pricing

Image to Video

Kling 4.0 Keyframe to Video API API Pricing

Turn a first frame, middle keyframes and a last frame into a Kling 4.0 video. 3-30s, 720p/1080p. Pay per generation, no subscription.

Savings Alert-423% ↓Cheaper than Competitor

About Kling 4.0 Keyframe to Video API

Kling 4.0 Keyframe-to-Video generates a 3-30 second clip at 720p or 1080p from a first frame, up to 8 middle keyframes and a last frame. Mention the frames in your prompt with @first_frame, @keyframe_1 and @last_frame to describe how the scene moves between them. The output follows the first frame's aspect ratio. For character, voice and video references use [Kling 4.0 Reference to Video](/playground/kling-4.0-reference-to-video).

Interactive Savings Calculator

Estimate monthly API spend and compare absolute developer savings.

Monthly API Generations10,000 runs

50025,00050,00075,000100,000+

MuAPI Monthly Cost

$1570.00

$0.157 per second at 720p ($0.785 per 5s clip)

Competitor Cost

$300.00

$0.03 per run

Estimated Monthly Savings$-1270.00

Annual Savings$-15240.00

Detailed Pricing Breakdown

Provider	Estimated Rate	Notes
muapiapp	$0.157 per second at 720p ($0.785 per 5s clip)	$0.157/s at 720p, $0.235/s at 1080p.

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