Key Takeaways
Claude Sonnet 4.5 wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
- Has reasoning mode
GPT-4o wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
Price Advantage
GPT-4o
Benchmark Advantage
Claude Sonnet 4.5
Context Window
Claude Sonnet 4.5
Speed
GPT-4o
Pricing Comparison
Price Comparison
| Metric | Claude Sonnet 4.5 | GPT-4o | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $3.00 | $2.50 | GPT-4o |
| Output (per 1M tokens) | $15.00 | $10.00 | GPT-4o |
| Cache Read (per 1M) | $0.30 | $1.25 | Claude Sonnet 4.5 |
| Cache Write (per 1M) | $3.75 | N/A | Claude Sonnet 4.5 |
Using a 3:1 input/output ratio, GPT-4o is 27% cheaper overall.
Claude Sonnet 4.5 Providers
Amazon Bedrock $3.00 (Cheapest)
Google $3.00 (Cheapest)
Anthropic $3.00 (Cheapest)
GPT-4o Providers
OpenAI $2.50 (Cheapest)
Vercel $2.50 (Cheapest)
Azure $2.50 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
4
Claude Sonnet 4.5 Wins
0
GPT-4o Wins
Benchmark Scores
| Benchmark | Claude Sonnet 4.5 | GPT-4o | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 37.1 | 15.6 | |
Coding Index Code generation & understanding | 33.5 | 16.6 | |
Math Index Mathematical reasoning | 37.0 | - | - |
MMLU Pro Academic knowledge | 86.0 | - | - |
GPQA Graduate-level science | 72.7 | 52.1 | |
LiveCodeBench Competitive programming | 59.0 | 31.7 | |
Aider Real-world code editing | - | 74.4 | - |
AIME Competition math | - | 11.7 | - |
Claude Sonnet 4.5 significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
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-4o
128,000
tokens
Max output: 16,384 tokens
Claude Sonnet 4.5 has a 87% larger context window.
Speed Performance
| Metric | Claude Sonnet 4.5 | GPT-4o | Winner |
|---|---|---|---|
| Tokens/second | 70.4 tok/s | 86.1 tok/s | |
| Time to First Token | 1.07s | 0.58s |
GPT-4o responds 22% faster on average.
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4.5 | GPT-4o |
|---|---|---|
| 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-4o |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Sep 2025 | May 2024 |
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text
GPT-4o Modalities
Input
textimagefile
Output
text