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Legacy evaluation · V2

Seedance 2.0 Fast vs Gen-4.5

By Megaton TeamJuly 25, 2026

Seedance 2.0 Fast is the better overall choice over Gen-4.5. It scores higher in every quality category shown.

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Seedance 2.0 Fast
Gen-4.5
Our verdict

Seedance 2.0 Fast is the better choice

Seedance 2.0 Fast scores higher than Gen-4.5 in every quality category shown. Its biggest lead is in text rendering, and it also is the only model here with audio output.

ByteDance

ByteDance

Seedance 2.0 Fast

70.0Overall score
Rank
—
Price per minute
$4.54/min
Runway

Runway

Gen-4.5

40.0Overall score
Rank
#13
Price per minute
$7.20/min

Best for

Highest overall score

Seedance 2.0 Fast

Seedance 2.0 Fast leads the overall score by 30.0 points.

The overall score does not measure file reliability.

Best for

More readable text

Seedance 2.0 Fast

Seedance 2.0 Fast leads by 37.2 points.

Long or moving text still needs manual review.

Best for

Lower generation cost

Seedance 2.0 Fast

Seedance 2.0 Fast runs $4.54/min, against $7.20/min for Gen-4.5.

Provider prices can change.

Best for

Built-in audio

Seedance 2.0 Fast

Seedance 2.0 Fast generates audio with the video; Gen-4.5 does not.

This comparison does not score audio quality.

236
videos rated
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ratings
July 25, 2026
last updated

Reviewer scores

Scores by category

Seedance 2.0 Fast wins all 11 categories head-to-head. Each bar is the reviewer score out of 100.

Biggest gapText Fidelity: Seedance 2.0 Fast ahead by 37.2 points.
Closest categoryScene Consistency: Seedance 2.0 Fast ahead by 16.4 points.

Head-to-head scores

11 categories rated head-to-head

Seedance 2.0 FastGen-4.5
Physics
57.8
37.4
Prompt Adherence
68.4
47.0
Logic Consistency
68.1
35.6
Scene Consistency
54.5
38.1
Cinematography
74.7
44.0
2D Animation
66.8
41.0
3D Animation
65.7
38.5
Actor Performance
73.3
38.0
Objects
76.9
42.4
Animals
73.5
40.2
Text Fidelity
67.7
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

Seedance 2.0 Fast leads here by 37.2 points.

Matched Text outputs from Seedance 2.0 Fast and Gen-4.5
Loading video
Seedance 2.0 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

Seedance 2.0 Fast leads here by 20.3 points.

Matched Physics outputs from Seedance 2.0 Fast and Gen-4.5
Loading video
Seedance 2.0 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

Seedance 2.0 Fast leads here by 30.7 points.

Matched Cinematography outputs from Seedance 2.0 Fast and Gen-4.5
Loading video
Seedance 2.0 Fast
Loading video
Gen-4.5

Capabilities

Inputs and outputs

See full Seedance 2.0 Fast detailsSee full Gen-4.5 details
CapabilitySeedance 2.0 FastGen-4.5
Text inputYesYes
Image inputYesYes
Video inputYesYes
Audio inputYesNo
Image outputNoNo
Audio outputYesNo

FAQ

Common questions

Is Seedance 2.0 Fast better than Gen-4.5?

Seedance 2.0 Fast is better overall and scores higher in every quality category.

Is Seedance 2.0 Fast cheaper than Gen-4.5?

Gen-4.5 costs less at $7.20 per minute, compared with $7.26 for Seedance 2.0 Fast.

Does Seedance 2.0 Fast generate audio?

Yes, Seedance 2.0 Fast includes audio output.

Does Gen-4.5 generate audio?

No, Gen-4.5 does not include audio output.

Which model makes longer clips, Seedance 2.0 Fast or Gen-4.5?

Seedance 2.0 Fast supports longer clips at 15 seconds, compared with 10 seconds for Gen-4.5.

Which model scores higher on Text Fidelity, Seedance 2.0 Fast or Gen-4.5?

Seedance 2.0 Fast scores higher for text rendering.

Which model scores higher on Actor Performance, Seedance 2.0 Fast or Gen-4.5?

Seedance 2.0 Fast scores higher for actor performance.

How are Seedance 2.0 Fast and Gen-4.5 compared?

Megaton compares each model's latest published scores. The side-by-side videos use the same prompts.

Continue researching

Seedance 2.0 Fast

Gen-4.5

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Methodology

How we tested Seedance 2.0 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
Scores come from each model's latest published evaluation. The side-by-side videos use the same prompts so you can compare the results directly.
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 25, 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
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