Key Takeaways
Claude Sonnet 4.5 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
Grok 3 Fast wins:
- No clear advantages in compared metrics
Price Advantage
Claude Sonnet 4.5
Benchmark Advantage
Claude Sonnet 4.5
Context Window
Claude Sonnet 4.5
Speed
Claude Sonnet 4.5
Pricing Comparison
Benchmark Comparison
Context & Performance
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4.5 | Grok 3 Fast |
|---|---|---|
Vision (Image Input) | ||
Tool/Function Calls | ||
Reasoning Mode | ||
Audio Input | ||
Audio Output | ||
PDF Input | ||
Prompt Caching | ||
Web Search |
License & Release
| Property | Claude Sonnet 4.5 | Grok 3 Fast |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | Xai |
| Released | Sep 2025 | Unknown |
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text
Grok 3 Fast Modalities
Input
Output