Same-prompt test 5 · video · October 2026

Two people talking on a park bench (lip-sync): which AI does it best?

Veo 3.1 Fast wins with 7.5/10. Behind it: PixVerse V6 (7.0), Runway Gen-4.5 (6.5), Kling 3.0 (6.3). One 4-second clip per model, unedited, with whatever audio the model made.

The promptTwo people having a conversation on a park bench; she says "I told you it would work.".

#	Model	Overall	adherence	motion	quality	artifacts	Cost	Render
1	Veo 3.1 Fast	7.5	8	6	8	8	$0.60	120s
2	PixVerse V6	7.0	7	6	8	7	$0.21	46s
3	Runway Gen-4.5	6.5	6	6	7	7	$0.48	68s
4	Kling 3.0	6.3	6	5	7	7	$0.52	203s

Best per category: adherence Veo (8) · motion Veo & PixVerse & Runway (6) · quality Veo & PixVerse (8) · artifacts Veo (8)

Every output, ranked

#1 Veo 3.1 Fast

Veo 3.1 Fast 7.5

4s · audio · ~60 cr ($0.60) · 120s render

adherence 8motion 6quality 8artifacts 8
Close two-shot, she clearly speaks; natural expressions.

#2 PixVerse V6

PixVerse V6 7.0

4s · audio · 48 PixVerse cr ($0.21) · 46s render

adherence 7motion 6quality 8artifacts 7
Close two-shot with natural expressions, but her line is hard to see being spoken.

#3 Runway Gen-4.5

Runway Gen-4.5 6.5

4s · ~48 cr ($0.48) · 68s render

adherence 6motion 6quality 7artifacts 7
Wide shot on bench, mostly smiling; little visible dialogue.

#4 Kling 3.0

Kling 3.0 6.3

4s · audio · ~52 cr ($0.52) · 203s render

adherence 6motion 5quality 7artifacts 7
She speaks briefly, then both freeze; stiff.

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⚖️

Outputs are shown exactly as the API returned them (4s, 720p, default settings). Scores are editorial judgments on a fixed rubric, given without knowing which model made each output. One run is a snapshot, not a guarantee. Methodology

FAQ

Which AI is best for "AI video with dialogue and lip-sync"?

In our October 2026 test of this exact prompt, Veo 3.1 Fast wins with 7.5/10, ahead of PixVerse V6 (7.0), Runway Gen-4.5 (6.5), Kling 3.0 (6.3). Veo 3.1 Fast's output: Close two-shot, she clearly speaks; natural expressions.

What exact prompt was used?

“Two people having a conversation on a park bench; she says "I told you it would work.".” Every model got the same prompt with default settings, 4 seconds at 720p, and one best-effort retry only if a generation failed.

How were the outputs scored?

Each output was scored without knowing which model made it, from 1 to 10 on adherence, motion, quality, artifacts. The overall score is the average of those.

Keep exploring

Veo 3.1 Fast vs PixVerse V6 head-to-head · AI video lip-sync test · AI video with audio · All 20 prompts on one page · October rankings

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