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
GPT-4 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
Price Comparison
| Metric | Claude Sonnet 4.5 | GPT-4 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $3.00 | $30.00 | Claude Sonnet 4.5 |
| Output (per 1M tokens) | $15.00 | $60.00 | Claude Sonnet 4.5 |
| Cache Read (per 1M) | $0.30 | N/A | Claude Sonnet 4.5 |
| Cache Write (per 1M) | $3.75 | N/A | Claude Sonnet 4.5 |
Using a 3:1 input/output ratio, Claude Sonnet 4.5 is 84% cheaper overall.
Claude Sonnet 4.5 Providers
Amazon Bedrock $3.00 (Cheapest)
Google $3.00 (Cheapest)
Anthropic $3.00 (Cheapest)
GPT-4 Providers
OpenAI $30.00 (Cheapest)
Azure $30.00 (Cheapest)
Benchmark Comparison
7
Benchmarks Compared
2
Claude Sonnet 4.5 Wins
0
GPT-4 Wins
Benchmark Scores
| Benchmark | Claude Sonnet 4.5 | GPT-4 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 37.1 | 12.8 | |
Coding Index Code generation & understanding | 33.5 | 13.1 | |
Math Index Mathematical reasoning | 37.0 | - | - |
MMLU Pro Academic knowledge | 86.0 | - | - |
GPQA Graduate-level science | 72.7 | - | - |
LiveCodeBench Competitive programming | 59.0 | - | - |
Aider Real-world code editing | - | 67.7 | - |
Claude Sonnet 4.5 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
Max output: 64,000 tokens
GPT-4
8,191
tokens
Max output: 4,096 tokens
Claude Sonnet 4.5 has a 99% larger context window.
Speed Performance
| Metric | Claude Sonnet 4.5 | GPT-4 | Winner |
|---|---|---|---|
| Tokens/second | 70.4 tok/s | 25.4 tok/s | |
| Time to First Token | 1.07s | 0.73s |
Claude Sonnet 4.5 responds 177% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4.5 | GPT-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 | GPT-4 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Sep 2025 | May 2023 |
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text
GPT-4 Modalities
Input
text
Output
text