Key Takeaways
Claude Sonnet 4.5 wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
GPT-5.2 Pro wins:
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
Claude Sonnet 4.5
Benchmark Advantage
GPT-5.2 Pro
Context Window
Claude Sonnet 4.5
Speed
GPT-5.2 Pro
Pricing Comparison
Price Comparison
| Metric | Claude Sonnet 4.5 | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $3.00 | $10.50 | Claude Sonnet 4.5 |
| Output (per 1M tokens) | $15.00 | $84.00 | 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 79% cheaper overall.
Claude Sonnet 4.5 Providers
No provider data available
GPT-5.2 Pro Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Claude Sonnet 4.5 Wins
6
GPT-5.2 Pro Wins
Benchmark Scores
| Benchmark | Claude Sonnet 4.5 | GPT-5.2 Pro | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 37.1 | 51.3 | |
Coding Index Code generation & understanding | 33.5 | 48.7 | |
Math Index Mathematical reasoning | 37.0 | 99.0 | |
MMLU Pro Academic knowledge | 86.0 | 87.4 | |
GPQA Graduate-level science | 72.7 | 90.3 | |
LiveCodeBench Competitive programming | 59.0 | 88.9 |
GPT-5.2 Pro 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
GPT-5.2 Pro
400,000
tokens
Claude Sonnet 4.5 has a 60% larger context window.
Speed Performance
| Metric | Claude Sonnet 4.5 | GPT-5.2 Pro | Winner |
|---|---|---|---|
| Tokens/second | 47.8 tok/s | 60.6 tok/s | |
| Time to First Token | 1.25s | 38.98s |
GPT-5.2 Pro responds 27% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4.5 | GPT-5.2 Pro |
|---|---|---|
| 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-5.2 Pro |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Sep 2025 | Dec 2025 |
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text
GPT-5.2 Pro Modalities
Input
imagetextfile
Output
text