Model Comparison
Claude 3 Sonnet
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 11 benchmarks · Anthropic, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 7 metric wins Strongest on: Value, Throughput, Reasoning
Best Value
GPT-5.5 (xhigh)
100.0 value score
64.2 reasoning / $11.25/1M
Lowest Price
Claude 3 Sonnet
$3.00/1M input price
Best Reasoning
GPT-5.5 (xhigh)
64.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
74.9 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
GPT-5.5 (xhigh) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Claude 3 Sonnet is 1.7x cheaper on input tokens than GPT-5.5 (xhigh).
Reasoning gap
GPT-5.5 (xhigh) leads Claude 3 Sonnet by 45.3 points on reasoning.
Top-pick rationale
GPT-5.5 (xhigh) wins 7 measurable categories, including Value, Throughput, Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Claude 3 Sonnet
Anthropic
TTFT
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Time
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tok/s
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Tokens
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Cost
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GPT-5.5 (xhigh)
OpenAI
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | An Claude 3 Sonnet | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $3.00/1M | $5.00/1M |
| Output Cost | $15.00/1M | $30.00/1M |
| Blended (3:1) | $6.00/1M | $11.25/1M |
| Specifications | ||
| Organization | Anthropic | OpenAI |
| Release Date | Mar 4, 2024 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | — | 61.8 tok/s |
| TTFT | — | 17292ms |
| Latency | — | 17292ms |
| Composite Indices | ||
| Value Score | 55.2 | 100.0 |
| Reasoning Score | 18.9 | 64.2 |
| Intelligence | 4.7 | 54.8 |
| Coding | — | 74.9 |
| Standard Benchmarks | ||
| GPQA | 40.0% | 93.5% |
| MMLU Pro | 57.9% | — |
| HLE | 3.8% | 44.3% |
| LiveCodeBench | 17.5% | — |
| MATH 500 | 41.4% | — |
| AIME (Original) | 4.7% | — |
| SciCode | 22.9% | 56.1% |
| LCR | — | 74.3% |
| IFBench | — | 75.9% |
| TAU-bench v2 | — | 93.9% |
| TerminalBench Hard | — | 60.6% |
Key Takeaways
Claude 3 Sonnet offers the best value at $3.00/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (xhigh) has the strongest reasoning profile with a 64.2 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 74.9 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Claude 3 Sonnet
- Cost-sensitive applications
- High-volume processing
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
