Key Takeaways
Claude Sonnet 4.5 wins:
- Larger context window
- Faster response time
Grok 4 wins:
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
Claude Sonnet 4.5
Benchmark Advantage
Grok 4
Context Window
Claude Sonnet 4.5
Speed
Claude Sonnet 4.5
Pricing Comparison
Price Comparison
| Metric | Claude Sonnet 4.5 | Grok 4 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $3.00 | $3.00 | Tie |
| Output (per 1M tokens) | $15.00 | $15.00 | Tie |
| Cache Read (per 1M) | $0.30 | $0.75 | Claude Sonnet 4.5 |
| Cache Write (per 1M) | $3.75 | N/A | Claude Sonnet 4.5 |
Both models have similar overall pricing.
Claude Sonnet 4.5 Providers
No provider data available
Grok 4 Providers
No provider data available
Benchmark Comparison
8
Benchmarks Compared
0
Claude Sonnet 4.5 Wins
6
Grok 4 Wins
Benchmark Scores
| Benchmark | Claude Sonnet 4.5 | Grok 4 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 37.1 | 41.5 | |
Coding Index Code generation & understanding | 33.5 | 40.5 | |
Math Index Mathematical reasoning | 37.0 | 92.7 | |
MMLU Pro Academic knowledge | 86.0 | 86.6 | |
GPQA Graduate-level science | 72.7 | 87.7 | |
LiveCodeBench Competitive programming | 59.0 | 81.9 | |
Aider Real-world code editing | - | 79.6 | - |
AIME Competition math | - | 94.3 | - |
Grok 4 significantly outperforms in coding benchmarks.
Cost vs Quality
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Y-axis:
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Claude Sonnet 4.5
Other models
Context & Performance
Context Window
Claude Sonnet 4.5
1,000,000
tokens
Grok 4
256,000
tokens
Claude Sonnet 4.5 has a 74% larger context window.
Speed Performance
| Metric | Claude Sonnet 4.5 | Grok 4 | Winner |
|---|---|---|---|
| Tokens/second | 47.8 tok/s | 43.0 tok/s | |
| Time to First Token | 1.25s | 11.46s |
Claude Sonnet 4.5 responds 11% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4.5 | Grok 4 |
|---|---|---|
| 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 4 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | Xai |
| Released | Sep 2025 | Jul 2025 |
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text
Grok 4 Modalities
Input
imagetext
Output
text