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Legacy evaluation · V1

LTX-2 19B vs Gen-4.5

By Megaton TeamJuly 22, 2026

LTX-2 19B is the better overall choice over Gen-4.5. It scores higher in most quality categories shown and costs less.

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LTX-2 19B
Gen-4.5
Our verdict

LTX-2 19B is the better choice

LTX-2 19B scores higher than Gen-4.5 in most quality categories shown. Its biggest lead is in actor performance, and it also costs less.

Lightricks

Lightricks

LTX-2 19B

43.0Overall score
Rank
—
Price per minute
$2.39/min
Runway

Runway

Gen-4.5

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

Best for

Highest overall score

LTX-2 19B

LTX-2 19B leads the overall score by 3.0 points.

The overall score does not measure file reliability.

Best for

More readable text

Gen-4.5

Gen-4.5 leads by 11.2 points.

Long or moving text still needs manual review.

Best for

Lower generation cost

LTX-2 19B

LTX-2 19B runs $2.39/min, against $7.20/min for Gen-4.5.

Provider prices can change.

Best for

Built-in audio

LTX-2 19B

LTX-2 19B 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

LTX-2 19B wins 8 of 11 categories head-to-head. Each bar is the reviewer score out of 100.

Biggest gapLogic Consistency: Gen-4.5 ahead by 18.7 points.
Closest categoryPrompt Adherence: LTX-2 19B ahead by 3.0 points.

Head-to-head scores

11 categories rated head-to-head

LTX-2 19BGen-4.5
Physics
41.9
37.4
Prompt Adherence
50.0
47.0
Logic Consistency
16.8
35.6
Scene Consistency
52.2
38.1
Cinematography
53.4
44.0
2D Animation
55.0
41.0
3D Animation
28.3
38.5
Actor Performance
54.3
38.0
Objects
47.6
42.4
Animals
54.6
40.2
Text Fidelity
19.3
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

Gen-4.5 leads here by 11.2 points.

Matched Text outputs from LTX-2 19B and Gen-4.5
Loading video
LTX-2 19B
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

LTX-2 19B leads here by 4.4 points.

Matched Physics outputs from LTX-2 19B and Gen-4.5
Loading video
LTX-2 19B
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

LTX-2 19B leads here by 9.4 points.

Matched Cinematography outputs from LTX-2 19B and Gen-4.5
Loading video
LTX-2 19B
Loading video
Gen-4.5

Capabilities

Inputs and outputs

See full LTX-2 19B detailsSee full Gen-4.5 details
CapabilityLTX-2 19BGen-4.5
Text inputYesYes
Image inputYesYes
Video inputYesYes
Audio inputYesNo
Image outputNoNo
Audio outputYesNo

FAQ

Common questions

Is LTX-2 19B better than Gen-4.5?

LTX-2 19B is better overall and leads most quality categories.

Is LTX-2 19B cheaper than Gen-4.5?

LTX-2 19B costs less at $2.39 per minute, compared with $7.20 for Gen-4.5.

Does LTX-2 19B generate audio?

Yes, LTX-2 19B includes audio output.

Does Gen-4.5 generate audio?

No, Gen-4.5 does not include audio output.

Which model makes longer clips, LTX-2 19B or Gen-4.5?

Gen-4.5 supports longer clips at 10 seconds, compared with 5 seconds for LTX-2 19B.

Which model scores higher on Logic Consistency, LTX-2 19B or Gen-4.5?

Gen-4.5 scores higher for logical consistency.

Which model scores higher on Anime Animation, LTX-2 19B or Gen-4.5?

Gen-4.5 scores higher for anime.

How are LTX-2 19B 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

LTX-2 19B

Gen-4.5

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Kling 3 Pro vs Veo 3.1Kling AI (Kuaishou)Google76.0 / 63.0

Methodology

How we tested LTX-2 19B 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
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