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Grok vs Runway Gen-4.5
Grok 2025 edges out Gen-4.5 overall (Grok 2025 54.0 vs Gen-4.5 40.0.) Grok 2025 is a very respectable entry and for its model generation is probably one of the best for rapid iteration given the cost. Especially with a subscription, Grok allows you to generate a ton and is extremely competent. If you're looking for a cheap daily runner, this would be it. The main tradeoffs are in Deprecated model, where Gen-4.5 tends to score better.
Grok 2025xai | Gen-4.5Runway |
|---|---|
Good for
| Good for
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Bad for
| Bad for
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Modalities
| Capability | Grok 2025 | Gen-4.5 |
|---|---|---|
| Text input | ||
| Image input | ||
| Video input | ||
| Audio input | ||
| Image output | ||
| Audio output |
Providers
Provider
xai
xAI
xai is the platform that serves Grok 2025 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.
Grok 2025 leads on physics (+8.5), with a measurable advantage over Gen-4.5. The clearest separation is on Physics (+8.5). 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, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Physics | 45.9 | 37.4 |
Prompt and Logic
Measures how accurately the model follows prompts and maintains logical consistency throughout the video.
Grok 2025 leads on prompt and logic (+14.7), with a measurable advantage over Gen-4.5. The clearest separation is on Scene Consistency (+28.8). Across the other sub-metrics in this group, the gap is smaller but generally consistent with the overall direction. If prompt and logic is a priority for your prompts, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Prompt Adherence | 54.5 | 47.0 |
| Logic Consistency | 43.3 | 35.6 |
| Scene Consistency | 66.9 | 38.1 |
Aesthetics
Visual quality including cinematography, artistic taste, and overall production value.
Grok 2025 leads on aesthetics (+4.5), with a measurable advantage over Gen-4.5. The clearest separation is on Cinematography (+8.7). 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, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Cinematography | 52.7 | 44.0 |
| Taste | — | — |
| Quality | 0.5 | 0.3 |
Animation
Performance on animated content styles including 2D, 3D, and anime-style animation.
Grok 2025 leads on animation (+15.9), with a measurable advantage over Gen-4.5. The clearest separation is on 2D Animation (+31.5). 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, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| 2D Animation | 72.5 | 41.0 |
| 3D Animation | 67.7 | 38.5 |
| Anime Animation | 39.5 | 52.5 |
Humans
Accuracy of human rendering including body proportions, hand details, and realistic actor performances.
Gen-4.5 leads on humans (+5.8), with a measurable advantage over Grok 2025. The clearest separation is on Hands (+8.3). 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, Gen-4.5 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Human | 57.9 | — |
| Hands | 39.7 | 48.0 |
| Actor Performance | 34.7 | 38.0 |
Objects and Animals
Quality of rendering inanimate objects and animals with accurate shapes, textures, and movements.
Grok 2025 leads on objects and animals (+12.5), with a measurable advantage over Gen-4.5. The clearest separation is on Animals (+14.3). 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, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Objects | 53.1 | 42.4 |
| Animals | 54.5 | 40.2 |
Text
Ability to render readable, accurate text and typography within generated videos.
Grok 2025 leads on text (+6.5), with a measurable advantage over Gen-4.5. The clearest separation is on Text Fidelity (+6.5). 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, Grok 2025 is the safer pick here.
| Metric | Grok 2025 | Gen-4.5 |
|---|---|---|
| Text Fidelity | 37.0 | 30.5 |
Cost and Speed
Practical factors including pricing per video and generation latency.
Grok 2025 and Gen-4.5 are effectively tied on cost and speed, with small tradeoffs across the metrics. 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 | Grok 2025 | Gen-4.5 |
|---|---|---|
| Price / sec | $0.050 | $0.050 |
| Price / min | $3.00 | $3.00 |
| Latency | 0ms | 0ms |