For a long time AI video was silent — you generated a clip, then built the entire soundtrack separately. In 2026 that changed: the top models now produce native audio, generating ambient sound, effects and even synced dialogue in the same pass as the picture. Here's which generators make sound, which don't, and how to get audio either way.
Which models make sound?
| Model | Native audio | What it generates | Best for |
|---|---|---|---|
| Veo 3.1 | Yes | Synced dialogue, effects, ambience | Talking shots, ads |
| Sora 2 | Yes | Ambient sound, effects | Realistic footage |
| Kling | No | Visuals only | Animating stills (add audio) |
| Seedance | No | Visuals only | Motion (add audio) |
| Hailuo | No | Visuals only | Volume (add audio) |
Veo 3.1 — synced dialogue
Veo 3.1 is the one to reach for when a shot needs to talk. It generates synced dialogue along with ambient sound and effects, so a spokesperson or character speaks without a separate voiceover pass — a huge time-saver for ads and explainer content. Combined with its cinematic prompt fidelity, it's the most complete "sound-on" generator. See the Veo 3.1 guide.
Best for: dialogue scenes, ads, anything where lips and audio must match.
Sora 2 — realistic footage with sound
Sora 2 generates ambient sound and effects baked into believable footage — footsteps, room tone, environmental audio that matches what's on screen. Where Veo leans into dialogue, Sora leans into realism with sound that grounds it. See the Sora 2 guide. Compare both in Veo 3 vs Kling 3.0 vs Sora 2.
Best for: realistic scenes where ambient sound sells the shot.
The visual-only models — and how to add sound
Kling, Seedance and Hailuo focus on the picture, which is the right trade for cheap, high-volume or image-to-video work. For these, build the audio afterwards:
- Voiceover — ElevenLabs TTS for narration or dialogue.
- Music — Suno or Lyria for the score.
- Sound effects — ElevenLabs SFX for foley and ambience.
This "visuals now, audio after" route is often better anyway when you want full control over the mix. See our guide to ElevenLabs TTS and SFX.
When to use native audio vs add-it-after
- Talking-head or dialogue shot? Native audio (Veo) — fastest, lips sync.
- Realistic scene where ambience matters? Native audio (Sora).
- Cheap volume, B-roll, animating stills? Visual-only model + add audio in the edit for full control.
The all-in-one angle
Whether you want sound generated in the clip or layered after, you need both the video models and the audio models. Nexvy runs Veo 3.1 and Sora 2 for native-audio video alongside Kling, Seedance and Hailuo, plus ElevenLabs voice/SFX and Suno/Lyria music — so you generate sound-on video, or add a custom mix afterwards, all from one account and one credit balance. See the video and audio generators.
Frequently asked questions
Which AI video generators have sound in 2026?
Veo 3.1 and Sora 2 generate native audio — ambient sound, effects and synced dialogue — in the same pass as the video. Most other models (Kling, Seedance, Hailuo) focus on visuals, so you add audio afterwards with AI voiceover, music and sound effects.
What's the best AI video generator with native audio?
Veo 3.1 is the standout for synced dialogue and a cinematic look, while Sora 2 leads on realistic footage with built-in ambient sound. For talking shots and ads where audio matters, these two are the picks; for silent B-roll, the cheaper visual-only models are fine.
Can I add sound to AI video that doesn't generate audio?
Yes. For models like Kling or Seedance, generate the visuals, then layer AI voiceover (ElevenLabs), music (Suno/Lyria) and sound effects (ElevenLabs SFX) in the edit. On a multi-model platform you can do both in one place.
Where can I use sound-on AI video models?
Nexvy runs Veo 3.1 and Sora 2 (native audio) alongside Kling, Seedance and Hailuo, plus ElevenLabs for voice/SFX and Suno/Lyria for music — so you can generate sound-on video or add audio afterwards, all from one account.
The bottom line
In 2026, Veo 3.1 and Sora 2 generate native audio — dialogue and ambience in one pass — while Kling, Seedance and Hailuo stay visual-only and let you build the mix yourself. Pick native audio for talking and realistic shots; add-it-after for cheap volume and full control. Do both on Nexvy, video and audio in one place.
