Price, 4 s · 1080p: 28 coins · Lite vs 73 coins · Reference for Kling 4.0
Kling 4.0
Maximum duration: 30 s vs 8 s for Veo 3.1
Input photos: up to 8 vs up to 3 for Veo 3.1
Input videos: up to 5 vs No for Veo 3.1
Input audio files: up to 3 vs No for Veo 3.1
Key differences
Veo 3.1: A short scene with both picture and sound in mind, from rustling fabric to a character's line.
Kling 4.0: A clip of up to 30 seconds from text and references or from a chain of keyframes: named characters, voice samples and exact frames.
Specifications
Spec
Veo 3.1
Kling 4.0
Model variants
Lite / Fast / Quality
Reference / Keyframes
Generation modes
from text / from first and last frames / from references
from text / from first and last frames / from references
First frame
Yes
Yes
Last frame
Yes
Yes
Input photos
up to 3
up to 8
Input videos
No
up to 5
Input audio files
No
up to 3
Input video length
No
2–30 s
Output audio
Native
—
Minimum duration
4 s
3 s
Maximum duration
8 s
30 s
Resolutions
720p / 1080p
720p / 1080p
Aspect ratios
9:16 / 16:9 / auto
9:16 / 16:9 / 1:1 / auto / 21:9
Prompt limit
1,000 characters
8,000 characters
Price, 4 s · 1080p
28 coins · Lite
73 coins · Reference
What to compare visually
For a fair A/B test, use the same scene and, where both modes allow it, the same first frame. Inspect motion continuity, character and object consistency, physics and contacts, camera behavior, temporal deformation, in-clip cuts and audio synchronization.
What to inspect with Veo 3.1
A short scene with both picture and sound in mind, from rustling fabric to a character's line.
Lite, Fast and Quality are separately priced versions. Test the idea with an affordable option, then compare another version using the same brief.
Text mode needs no images. Frame mode takes a first image and an optional last one. Reference mode accepts 1–3 photos for subjects, products and the scene.
Review written signs and pronunciation separately from the visual quality.
Very different first and last frames can produce an awkward transformation rather than a believable transition.
What to inspect with Kling 4.0
A clip of up to 30 seconds from text and references or from a chain of keyframes: named characters, voice samples and exact frames.
Text and references: up to 10 reference photos and 5 videos, up to 7 characters (2–4 photos or one 3–8 second video clip each) and up to 3 voice samples. The Video sound switch applies only to reference videos.
Keyframes: a first frame, a last frame and up to 8 middle frames. The total number of frames depends on the duration and never exceeds 10.
The modes do not mix: Keyframes accepts no video, and characters and voices belong only to Text and references mode.
A hero photo must be at least 300 pixels on the short side; a video character needs at least 700 pixels and one continuous shot.
How to run a fair comparison
Fix the scene, the first frame (if both models accept one), the duration and the resolution.
Judge motion, not stills: faces, hands and objects should hold across the whole clip and at cuts.
If sound matters, listen to it separately: dialogue, effects and lip sync differ between models.
Price a finished clip, not a second: the per-second rate times your real duration, rounded up once.
Sources
Prices, availability and specifications come from the Mixer AI catalog. This is not an independent test: try both models on the same task before choosing.
Price, 4 s · 1080p: Veo 3.1 28 coins · Lite, Kling 4.0 73 coins · Reference. Veo 3.1 is cheaper. The total depends on your settings: the price of the chosen options is shown in the interface before you run.
How does Veo 3.1 differ from Kling 4.0?
Veo 3.1 — price, 4 s · 1080p: 28 coins · Lite. Kling 4.0 — maximum duration: 30 s; input photos: up to 8; input videos: up to 5.
How should I compare Veo 3.1 and Kling 4.0 fairly?
Fix the scene, first frame, duration and resolution. Watch the motion across the whole clip and listen to the sound separately. Price the finished clip, not one second.
Are both models available in Mixer AI?
Yes. Both models are in the Mixer AI video catalog; the launch button on the page opens Canvas on a computer and the Studio on a phone. The page exists only for models in the current catalog.
Which model is better?
There is no single winner. First rule out the model that lacks the duration, first or last frame, sound or resolution you need, then compare clips on your own scene. The table highlights only measurable differences.
Mixer AI
