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LTX 2 19B vs Runway Gen-4.5
LTX-2 19B edges out Gen-4.5 overall (LTX-2 19B 43.0 vs Gen-4.5 40.0.) LTX-2 is an open-source option with low hardware requirements, making it accessible for experimentation. The tradeoff is configuration complexity and inconsistent output quality. The model appears trained heavily on old-school film stock, so vintage aesthetics can occur more often than with other models. Animation performance is weak outside of old-timey styles, and text rendering is poor. The main tradeoffs are in Difficult to configure, Wide quality variance, 3D animation, Animation (except vintage cartoons), Text rendering, where Gen-4.5 tends to score better.
LTX-2 19BLightricks | Gen-4.5Runway |
|---|---|
Good for
| Good for
|
Bad for
| Bad for
|
Modalities
| Capability | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Text input | ||
| Image input | ||
| Video input | ||
| Audio input | ||
| Image output | ||
| Audio output |
Providers
Provider
Lightricks
lightricks
Lightricks is the platform that serves LTX-2 19B requests, pricing, and availability.
Provider
Runway
runway-ml
Runway is the platform that serves Gen-4.5 requests, pricing, and availability.
Physics
How well the model simulates real-world physics: gravity, momentum, collisions, and natural movement.
LTX-2 19B leads on physics (+4.5), with a measurable advantage over Gen-4.5. The clearest separation is on Physics (+4.4). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If physics is a priority for your prompts, LTX-2 19B is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Physics | 41.9 | 37.4 |
Prompt and Logic
Measures how accurately the model follows prompts and maintains logical consistency throughout the video.
LTX-2 19B and Gen-4.5 are effectively tied on prompt and logic, with small tradeoffs across the metrics. The biggest separation is on Logic Consistency (18.7), but it's not decisive overall. In practice, you should decide based on the specific sub-metric you care about most, since neither model consistently dominates this slice of the rubric.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Prompt Adherence | 50.0 | 47.0 |
| Logic Consistency | 16.8 | 35.6 |
| Scene Consistency | 52.2 | 38.1 |
Aesthetics
Visual quality including cinematography, artistic taste, and overall production value.
LTX-2 19B leads on aesthetics (+4.8), with a measurable advantage over Gen-4.5. The clearest separation is on Cinematography (+9.4). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If aesthetics is a priority for your prompts, LTX-2 19B is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Cinematography | 53.4 | 44.0 |
| Taste | — | — |
| Quality | 0.3 | 0.3 |
Animation
Performance on animated content styles including 2D, 3D, and anime-style animation.
Gen-4.5 leads on animation (+4.6), with a measurable advantage over LTX-2 19B. The clearest separation is on Anime Animation (+17.5). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If animation is a priority for your prompts, Gen-4.5 is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| 2D Animation | 55.0 | 41.0 |
| 3D Animation | 28.3 | 38.5 |
| Anime Animation | 35.0 | 52.5 |
Humans
Accuracy of human rendering including body proportions, hand details, and realistic actor performances.
LTX-2 19B leads on humans (+1.5), with a measurable advantage over Gen-4.5. The clearest separation is on Actor Performance (+16.3). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If humans is a priority for your prompts, LTX-2 19B is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Human | 33.6 | — |
| Hands | 34.6 | 48.0 |
| Actor Performance | 54.3 | 38.0 |
Objects and Animals
Quality of rendering inanimate objects and animals with accurate shapes, textures, and movements.
LTX-2 19B leads on objects and animals (+9.9), with a measurable advantage over Gen-4.5. The clearest separation is on Animals (+14.4). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If objects and animals is a priority for your prompts, LTX-2 19B is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Objects | 47.6 | 42.4 |
| Animals | 54.6 | 40.2 |
Text
Ability to render readable, accurate text and typography within generated videos.
Gen-4.5 leads on text (+11.2), with a measurable advantage over LTX-2 19B. The clearest separation is on Text Fidelity (+11.2). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If text is a priority for your prompts, Gen-4.5 is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Text Fidelity | 19.3 | 30.5 |
Cost and Speed
Practical factors including pricing per video and generation latency.
LTX-2 19B leads on cost and speed (+0.8), with a measurable advantage over Gen-4.5. The clearest separation is on Price / min (+2.4). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If cost and speed is a priority for your prompts, LTX-2 19B is the safer pick here.
| Metric | LTX-2 19B | Gen-4.5 |
|---|---|---|
| Price / sec | $0.040 | $0.050 |
| Price / min | $0.58 | $3.00 |
| Latency | 0ms | 0ms |