The alternative is what everyone did until recently: generate a silent clip, then source or generate sound and align it by hand. That works, and it is slow, and the alignment is only ever as good as your patience. A model producing both together has the picture and the sound agreeing by construction — footsteps land on the footfall because both came out of the same generation.
The quality is uneven by category. Ambience and simple effects are broadly convincing; dialogue is where it gets interesting, because the model is deciding not just what a voice sounds like but what it says, unless your prompt pinned that down.
It also changes what a prompt should contain. On an audio-enabled model, sound is part of the brief — what is heard, whether anyone speaks, what the room sounds like — and leaving that out means the model chooses for you.
In practice
- Write the sound into the prompt: dialogue in quotes, ambience named, effects described.
- Generated audio is baked into the clip — replacing it later is an edit, not a setting.
- For scripted lines you must control exactly, a silent generation plus dedicated voice work is still safer.
Models that generate their own audio
Catalog entries flagged as producing sound alongside picture. 136 of the 385 models in the Versely catalog qualify.
| Model | Provider | Type |
|---|---|---|
| HeyGen Video | HeyGen | Video |
| Wan 3.0 Text to Video | Wan | Video |
| Seedance 2.5 | ByteDance | Video |
| Flux 3 Text to Video | Black Forest Labs | Video |
| Seedance 2.0 | ByteDance | Video |
| Grok Imagine Video 1.5 Text to Video | Grok | Video |
| Kling O3 Pro Image to Video | Kling | Video |
| Kling Video V3 Pro Text to Video | Kling | Video |
Browse all 62 spec pages for full settings, resolutions and credit costs.
The mistake to avoid
Assuming a silent result means the model has no audio. Many models expose audio as an off-by-default switch.
Go deeper
Native audio in video models without a TTS pass
How native audio video models like VEO 3.1, Vidu Q3, LTX 2.3, and Flux 3 generate dialogue, ambience, and sync in one pass — and when to still use TTS.
Where you will run into it
- Replace the Audio in a Video — Mute the original. Put your own sound in its place.
- Add a Voiceover to a Video — Type the script. Get a narrated video back.
- AI Video Generator — Text-to-video, image-to-video, and story chaining in one studio.
Related terms
Audio-to-video
Audio-to-video generation drives the picture from a soundtrack: the audio is the primary input and the visuals are generated to agree with it.
Text-to-speech
Text-to-speech converts written text into spoken audio using a synthetic voice you choose before generating.
AI dubbing
AI dubbing meaning: replacing spoken audio with another language, usually keeping the speaker voice and optionally re-syncing lips.
Lipsync
Lipsync meaning: an AI model moves a face's mouth to match an audio track, so the words look spoken by that face instead of dubbed over the top.
Temporal consistency
Temporal consistency means staying stable over time; in video, each frame agrees with the one before, so nothing flickers, shimmers or drifts as it plays.
The all-in-one AI studio for creators. 60+ models for video, image, voice, music and lipsync, in your browser or on your phone.
One account for the web and iPhone.