Model Comparison
Claude Opus 4.5 (Reasoning)
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 10 benchmarks · Anthropic, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 10 metric wins Strongest on: Throughput, Intelligence, Coding
Best Value
Claude Opus 4.5 (Reasoning)
100.0 value score
69.5 reasoning / $10.00/1M
Lowest Price
Claude Opus 4.5 (Reasoning)
$5.00/1M input price
Best Reasoning
Claude Opus 4.5 (Reasoning)
69.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
59.1 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
Claude Opus 4.5 (Reasoning) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Reasoning gap
Claude Opus 4.5 (Reasoning) leads GPT-5.5 (xhigh) by 3.5 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads Claude Opus 4.5 (Reasoning) by 11.3 points on coding.
Top-pick rationale
GPT-5.5 (xhigh) wins 10 measurable categories, including Throughput, Intelligence, Coding, GPQA.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Claude Opus 4.5 (Reasoning)
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
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Cost
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Which answer was more useful?
Full Comparison
| Metric | An Claude Opus 4.5 (Reasoning) | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $5.00/1M | $5.00/1M |
| Output Cost | $25.00/1M | $30.00/1M |
| Blended (3:1) | $10.00/1M | $11.25/1M |
| Specifications | ||
| Organization | Anthropic | OpenAI |
| Release Date | Nov 24, 2025 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 60.0 tok/s | 62.1 tok/s |
| TTFT | 9610ms | 73918ms |
| Latency | 9610ms | 73918ms |
| Composite Indices | ||
| Value Score | 100.0 | 84.5 |
| Reasoning Score | 69.5 | 66.0 |
| Intelligence | 49.7 | 60.2 |
| Coding | 47.8 | 59.1 |
| Math | 91.3 | — |
| Standard Benchmarks | ||
| GPQA | 86.6% | 93.5% |
| MMLU Pro | 89.5% | — |
| HLE | 28.4% | 44.3% |
| LiveCodeBench | 87.1% | — |
| AIME 2025 | 91.3% | — |
| SciCode | 49.5% | 56.1% |
| LCR | 74.0% | 74.3% |
| IFBench | 58.0% | 75.9% |
| TAU-bench v2 | 89.5% | 93.9% |
| TerminalBench Hard | 47.0% | 60.6% |
Key Takeaways
Claude Opus 4.5 (Reasoning) offers the best value at $5.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Claude Opus 4.5 (Reasoning) has the strongest reasoning profile with a 69.5 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 59.1 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 Opus 4.5 (Reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
GPT-5.5 (xhigh)
- Code generation
- Software development
