Model Comparison
Gemini 2.5 Pro
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 12 benchmarks · Google, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 9 metric wins Strongest on: Intelligence, Coding, GPQA
Best Value
Gemini 2.5 Pro
100.0 value score
70.5 reasoning / $3.44/1M
Lowest Price
Gemini 2.5 Pro
$1.25/1M input price
Best Reasoning
Gemini 2.5 Pro
70.5 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
Gemini 2.5 Pro has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Gemini 2.5 Pro is 4.0x cheaper on input tokens than GPT-5.5 (xhigh).
Speed gap
Gemini 2.5 Pro generates about 2.0x as many tokens per second as GPT-5.5 (xhigh).
Reasoning gap
Gemini 2.5 Pro leads GPT-5.5 (xhigh) by 6.3 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads Gemini 2.5 Pro by 42.9 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Gemini 2.5 Pro
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
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tok/s
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Tokens
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Cost
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Which answer was more useful?
Full Comparison
| Metric | Go Gemini 2.5 Pro | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $5.00/1M |
| Output Cost | $10.00/1M | $30.00/1M |
| Blended (3:1) | $3.44/1M | $11.25/1M |
| Specifications | ||
| Organization | OpenAI | |
| Release Date | Jun 5, 2025 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 122.2 tok/s | 62.6 tok/s |
| TTFT | 18901ms | 52139ms |
| Latency | 18901ms | 52139ms |
| Composite Indices | ||
| Value Score | 100.0 | 27.8 |
| Reasoning Score | 70.5 | 64.2 |
| Intelligence | 27.0 | 54.8 |
| Coding | 32.0 | 74.9 |
| Math | 87.7 | — |
| Standard Benchmarks | ||
| GPQA | 84.4% | 93.5% |
| MMLU Pro | 86.2% | — |
| HLE | 21.1% | 44.3% |
| LiveCodeBench | 80.1% | — |
| MATH 500 | 96.7% | — |
| AIME 2025 | 87.7% | — |
| AIME (Original) | 88.7% | — |
| SciCode | 42.8% | 56.1% |
| LCR | 66.0% | 74.3% |
| IFBench | 48.7% | 75.9% |
| TAU-bench v2 | 54.1% | 93.9% |
| TerminalBench Hard | 26.5% | 60.6% |
Key Takeaways
Gemini 2.5 Pro offers the best value at $1.25/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 2.5 Pro has the strongest reasoning profile with a 70.5 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
Gemini 2.5 Pro
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
GPT-5.5 (xhigh)
- Code generation
- Software development
