How much does AI video with sound cost?

It depends on the model and the settings, and the exact price is on the Generate button before you start. The lowest here is Kling 3.0: from 1.75 credits per second. A clip that fails costs nothing: its credits come back automatically.

Can I try it for free?

Yes. The free plan gives 20 credits every month with no card, enough for a clip of up to 11 seconds with Kling 3.0.

Can the characters speak?

Yes. Write the lines in quotes and say who speaks. Short lines come out clearest.

Can I add a voice-over to a silent video?

Make the voice-over on the Audio page from your text, then put it together with the clip in any video editor.

AI video with sound

Some video models make the sound together with the picture: voices, effects and music in the same take, so there is nothing to sync afterwards. On RenderHour these are Seedance 2.5, Google Veo 3.1, Kling 3.0, Gemini Omni Flash, Grok Imagine 1.5 and FLUX.3 Video.

Make a video with sound See plans

Models that do it

Seedance 2.5Flagship video model with native audioFrom 3 credits per secondTry Seedance 2.5
Google Veo 3.1Eight-second scenes with soundFrom 80 credits per clipTry Google Veo 3.1
Kling 3.0Steady motion, with or without audioFrom 1.75 credits per secondTry Kling 3.0
Gemini Omni FlashVideo with speech from one promptFrom 3 credits per secondTry Gemini Omni Flash
Grok Imagine 1.5Stylised clips with audioFrom 2.5 credits per secondTry Grok Imagine 1.5
FLUX.3 VideoFive-second clips with audioFrom 30 credits per clipTry FLUX.3 Video

How it works

Open the Video page and pick one of the models below.
Write the scene and the sound: put spoken lines in quotes, and name the effects and the music you want.
Check the settings (Kling 3.0 makes sound only when it is switched on) and the price on the Generate button.
Generate. A failed run costs nothing, and every result is kept in Assets.

Tips

Short lines of dialogue work best: one or two sentences per speaker in a clip.
Say who speaks and how: "a tired voice", "whispering", "shouting over the wind".
For a narrator over a silent clip, make the voice-over on the Audio page and put the two together in your editor.

Questions

How much does AI video with sound cost?: It depends on the model and the settings, and the exact price is on the Generate button before you start. The lowest here is Kling 3.0: from 1.75 credits per second. A clip that fails costs nothing: its credits come back automatically.
Can I try it for free?: Yes. The free plan gives 20 credits every month with no card, enough for a clip of up to 11 seconds with Kling 3.0.
Can the characters speak?: Yes. Write the lines in quotes and say who speaks. Short lines come out clearest.
Can I add a voice-over to a silent video?: Make the voice-over on the Audio page from your text, then put it together with the clip in any video editor.