Model Comparison
GPT-5.5 (medium)
vs. Gemini 3.1 Pro Preview
Comparing 2 AI models · 7 benchmarks · OpenAI, Google
Recommended Pick
Go Gemini 3.1 Pro Preview 13 metric wins Strongest on: Value, Input price, Output price
Best Value
Gemini 3.1 Pro Preview
100.0 value score
65.3 reasoning / $4.50/1M
Lowest Price
Gemini 3.1 Pro Preview
$2.00/1M input price
Best Reasoning
Gemini 3.1 Pro Preview
65.3 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (medium)
56.2 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 3.1 Pro Preview has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Gemini 3.1 Pro Preview is 2.5x cheaper on input tokens than GPT-5.5 (medium).
Speed gap
Gemini 3.1 Pro Preview generates about 2.2x as many tokens per second as GPT-5.5 (medium).
Reasoning gap
Gemini 3.1 Pro Preview leads GPT-5.5 (medium) by 2.0 points on reasoning.
Coding gap
GPT-5.5 (medium) leads Gemini 3.1 Pro Preview by 0.7 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.5 (medium)
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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Gemini 3.1 Pro Preview
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Which answer was more useful?
Full Comparison
| Metric | Op GPT-5.5 (medium) | Top Pick Go Gemini 3.1 Pro Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $5.00/1M | $2.00/1M |
| Output Cost | $30.00/1M | $12.00/1M |
| Blended (3:1) | $11.25/1M | $4.50/1M |
| Specifications | ||
| Organization | OpenAI | |
| Release Date | Apr 23, 2026 | Feb 19, 2026 |
| Performance & Speed | ||
| Throughput | 55.0 tok/s | 120.2 tok/s |
| TTFT | 5226ms | 22543ms |
| Latency | 5226ms | 22543ms |
| Composite Indices | ||
| Value Score | 38.8 | 100.0 |
| Reasoning Score | 63.3 | 65.3 |
| Intelligence | 56.7 | 57.2 |
| Coding | 56.2 | 55.5 |
| Standard Benchmarks | ||
| GPQA | 92.6% | 94.1% |
| HLE | 40.6% | 44.7% |
| SciCode | 53.5% | 58.9% |
| LCR | 72.3% | 72.7% |
| IFBench | 71.0% | 77.1% |
| TAU-bench v2 | 91.8% | 95.6% |
| TerminalBench Hard | 57.6% | 53.8% |
Key Takeaways
Gemini 3.1 Pro Preview offers the best value at $2.00/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 3.1 Pro Preview has the strongest reasoning profile with a 65.3 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (medium) reaches a 56.2 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
GPT-5.5 (medium)
- Code generation
- Software development
Gemini 3.1 Pro Preview
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
