Key Takeaways
Grok 3 wins:
- No clear advantages in compared metrics
Grok 4 Fast wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
- Supports vision
- Has reasoning mode
Price Advantage
Grok 4 Fast
Benchmark Advantage
Grok 4 Fast
Context Window
Grok 4 Fast
Speed
Grok 4 Fast
Pricing Comparison
Benchmark Comparison
Context & Performance
Capabilities
Feature Comparison
| Feature | Grok 3 | Grok 4 Fast |
|---|---|---|
Vision (Image Input) | ||
Tool/Function Calls | ||
Reasoning Mode | ||
Audio Input | ||
Audio Output | ||
PDF Input | ||
Prompt Caching | ||
Web Search |
License & Release
| Property | Grok 3 | Grok 4 Fast |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Xai | Xai |
| Released | Jun 2025 | Sep 2025 |
Grok 3 Modalities
Input
text
Output
text
Grok 4 Fast Modalities
Input
textimage
Output
text