Kling v3 Pro audio on adds 50% per second: what Sume bills

Switching audio on for Kling v3 Pro raises the price by exactly 50 percent. fal's model page, read on 2026-10-04, lists $0.112 a second with audio off and $0.168 a second with audio on. The same page lists $0.196 a second when voice control is used with audio. Sume's estimator for the model uses the same two list rates and applies its 1.25 factor.

Vendor list versus Sume billed

The Sume column is the provider list price times 1.25, which the video docs state applies to every model. The 5-second figures are from the repo's Kling v3 Pro estimator, called once with audio generation off and once with it on.

When audio is worth the extra 7 cents a second

On Sume the difference is $0.07 a second. For a 5-second clip that is $0.35, for a 15-second clip $1.05. If you are going to lay a voiceover or music bed over the clip in an edit anyway, generate with audio off and keep the clip cheaper. If the clip's own sound is the point, such as ambient room tone or a spoken line, audio on avoids a second step.

A quick rule

• Audio you will replace: off.
• Audio you will keep: on, and price it at $0.21 a second, not $0.14.
• Voice control is a third tier on fal's page ($0.196 list). It is not priced here on Sume, so check the models endpoint before assuming a figure.

The same 50 percent at every length

Because both rates are per second and the ratio is fixed at 1.5, the audio premium scales with length. A 5-second clip costs $0.35 more with audio on, a 10-second clip $0.70 more, and a 15-second clip $1.05 more. Across a batch of 100 ten-second clips the audio switch alone is $70.00 on Sume.

That is the number to put in front of whoever approves the budget. If the sound would be replaced in the edit, the audio-on premium on a batch is money spent on something you delete.

Always confirm the live rate. The video docs point to GET /v1/videos/models for each model's prices, and list rates at the vendor can change.