Megaton
#1
ByteDanceSeedance 2.5
#2
ByteDanceSeedance 2.0
#3
Black Forest LabsFLUX 3
#4
GoogleGemini Omni 1.1 Flash
#5
Kling AI (Kuaishou)Kling 3 Pro

Swipe for more top models

Legacy evaluation · V1

Veo 3.1 Fast vs Gen-4.5

By Megaton TeamJuly 22, 2026

Veo 3.1 Fast is the better overall choice over Gen-4.5. It scores higher in nearly every quality category shown and costs less.

Share
Veo 3.1 Fast
Gen-4.5
Our verdict

Veo 3.1 Fast is the better choice

Veo 3.1 Fast scores higher than Gen-4.5 in nearly every quality category shown. Its biggest lead is in hands, and it also costs less.

Google

Google

Veo 3.1 Fast

51.0Overall score
Rank
—
Price per minute
$6.00/min
Runway

Runway

Gen-4.5

40.0Overall score
Rank
#12
Price per minute
$7.20/min

Best for

Highest overall score

Veo 3.1 Fast

Veo 3.1 Fast leads the overall score by 11.0 points.

The overall score does not measure file reliability.

Best for

More readable text

Veo 3.1 Fast

Veo 3.1 Fast leads by 17.2 points.

Long or moving text still needs manual review.

Best for

Lower generation cost

Veo 3.1 Fast

Veo 3.1 Fast runs $6/min, against $7.20/min for Gen-4.5.

Provider prices can change.

Best for

Built-in audio

Veo 3.1 Fast

Veo 3.1 Fast generates audio with the video; Gen-4.5 does not.

This comparison does not score audio quality.

82
videos rated
0
measurements
0
ratings
July 22, 2026
last updated

Reviewer scores

Scores by category

Veo 3.1 Fast wins 8 of 11 categories head-to-head. Each bar is the reviewer score out of 100.

Biggest gap3D Animation: Gen-4.5 ahead by 23.5 points.
Closest categoryPrompt Adherence: Gen-4.5 ahead by 3.0 points.

Head-to-head scores

11 categories rated head-to-head

Veo 3.1 FastGen-4.5
Physics
45.7
37.4
Prompt Adherence
44.0
47.0
Logic Consistency
41.5
35.6
Scene Consistency
50.7
38.1
Cinematography
53.4
44.0
2D Animation
27.7
41.0
3D Animation
15.0
38.5
Actor Performance
56.3
38.0
Objects
57.6
42.4
Animals
55.1
40.2
Text Fidelity
47.7
30.5

Side-by-side video tests

Matched outputs, side by side

Each row uses the same evaluation input for both models. The underlying prompt and decision record are reserved for the full report.

Video test 1

Text

Spelling, letter shape, spacing, and whether the words remain stable while the scene moves.

Related category score

Veo 3.1 Fast leads here by 17.2 points.

Matched Text outputs from Veo 3.1 Fast and Gen-4.5
Loading video
Veo 3.1 Fast
Loading video
Gen-4.5

Video test 2

Physics

Weight, contact, momentum, and whether objects continue to behave consistently from frame to frame.

Related category score

Veo 3.1 Fast leads here by 8.3 points.

Matched Physics outputs from Veo 3.1 Fast and Gen-4.5
Loading video
Veo 3.1 Fast
Loading video
Gen-4.5

Video test 3

Cinematography

Framing, camera movement, lighting continuity, and whether the visual treatment follows the prompt.

Related category score

Veo 3.1 Fast leads here by 9.4 points.

Matched Cinematography outputs from Veo 3.1 Fast and Gen-4.5
Loading video
Veo 3.1 Fast
Loading video
Gen-4.5

Capabilities

Inputs and outputs

See full Veo 3.1 Fast detailsSee full Gen-4.5 details
CapabilityVeo 3.1 FastGen-4.5
Text inputYesYes
Image inputYesYes
Video inputYesYes
Audio inputNoNo
Image outputNoNo
Audio outputYesNo

FAQ

Common questions

Is Veo 3.1 Fast better than Gen-4.5?

Veo 3.1 Fast is better overall and leads most quality categories.

Is Veo 3.1 Fast cheaper than Gen-4.5?

Veo 3.1 Fast costs less at $6 per minute, compared with $7.20 for Gen-4.5.

Does Veo 3.1 Fast generate audio?

Yes, Veo 3.1 Fast includes audio output.

Does Gen-4.5 generate audio?

No, Gen-4.5 does not include audio output.

Which model makes longer clips, Veo 3.1 Fast or Gen-4.5?

Gen-4.5 supports longer clips at 10 seconds, compared with 8 seconds for Veo 3.1 Fast.

Which model scores higher on Hands, Veo 3.1 Fast or Gen-4.5?

Veo 3.1 Fast scores higher for hands.

Which model scores higher on 3D Animation, Veo 3.1 Fast or Gen-4.5?

Gen-4.5 scores higher for 3D animation.

How are Veo 3.1 Fast and Gen-4.5 compared?

Megaton gives both models the same prompts and compares the resulting videos. Price, audio support, and maximum clip length are also checked.

Continue researching

Veo 3.1 Fast

Gen-4.5

More comparisons

More AI video model comparisons

Browse more head-to-head results, including scores, prices, and side-by-side video tests.

Other AI video model comparison pages
ComparisonProvidersOverall scores
Kling 3 Pro vs Gen-4.5Kling AI (Kuaishou)Runway76.0 / 40.0
Veo 3.1 vs Gen-4.5GoogleRunway63.0 / 40.0
Kling 3 Pro vs Veo 3.1Kling AI (Kuaishou)Google76.0 / 63.0

Methodology

How we tested Veo 3.1 Fast and Gen-4.5

We score two things separately: how good the video looks to a reviewer, and how reliably the file itself holds up. A model can make great-looking footage and still deliver clips with freezes, bad framing, or unstable motion.

We test every model with v-benchmark v2.0, our benchmark for AI video models — the same prompts, professional reviewers, and automated reliability checks behind every score here.

Reviewer scores
Both models receive the same prompts. Professional reviewers score how well each video follows the prompt and handles motion, composition, people, objects, animals, animation, and on-screen text. Scores use a 0-100 scale.
File reliability
Automated checks review 0 clips for freezes, bad framing, compression problems, unstable motion, distorted geometry, exposure problems, and invalid file properties.
Missing scores
Categories with a score for only one model are shown but excluded from the head-to-head win count. Price and generation speed stay separate because they use different units.
Last updated
Reviewer scores and rankings use results from July 22, 2026. Reliability results use the latest completed test for each model. Provider prices and rankings can change.
How v-benchmark v2.0 worksView the complete leaderboardRead model evaluation reports
Subscribe to the Megaton newsletter

Get weekly AI video rankings, evaluation updates, and industry news delivered to your inbox.