What are the duration and resolution limits?

3 to 20 seconds per clip at 720p only.

How many references can I use?

Up to 10 images, 5 videos and 7 elements (at most 3 video elements), with at most 15 materials in total. Reference videos plus video elements cannot exceed 5, and their combined duration must be 2-20 seconds.

How do I reference materials in the prompt?

Use @image_1, @video_1 in array order, or @name for elements. A mention with no matching material is rejected.

How do I add a voice?

Standalone voices are not supported on Flash. Set voice_url on a character element to bind reference audio to that character.

How is pricing calculated?

Per second of output video: $0.094/s with reference images or no references, and $0.126/s when reference videos or video elements are included. A 5-second clip costs $0.47 or $0.63.

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 Flash Reference to Video API Pricing

Image to Video

Kling 4.0 Flash Reference to Video API API Pricing

Generate Kling 4.0 Flash videos from reference images, videos and elements. 3-20s, 720p, native audio. Pay per generation, no subscription.

Savings Alert-213% ↓Cheaper than Competitor

About Kling 4.0 Flash Reference to Video API

Kling 4.0 Flash Reference-to-Video generates 3-20 second 720p clips with native audio from your own materials: up to 10 reference images, 5 reference videos and 7 named elements (2-4 images or a 3-8 second character video each), with at most 15 materials in total. Mention each material in the prompt with @image_1, @video_1 or @name, and bind character audio through an element's voice_url. With no materials it behaves as plain text-to-video. For 1080p, 30-second clips and standalone voices use [Kling 4.0 Reference to Video](/playground/kling-4.0-reference-to-video); to animate a single still use [Kling 4.0 Flash Keyframe to Video](/playground/kling-4.0-flash-keyframe-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

$940.00

$0.094 per second ($0.47 per 5s clip)

Competitor Cost

$300.00

$0.03 per run

Estimated Monthly Savings$-640.00

Annual Savings$-7680.00

Detailed Pricing Breakdown

Provider	Estimated Rate	Notes
muapiapp	$0.094 per second ($0.47 per 5s clip)	$0.094/s of output video for text, keyframe and reference-image requests; $0.126/s when reference videos or video elements are included. 720p only.

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