Gemini 3.1 Pro vs GPT-5.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.5 by OpenAI wins on 7 of 11 benchmarks against Gemini 3.1 Pro by Google, which leads on 4. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, GPT-5.5 scores 38.6 on AA Intelligence Index compared to Gemini 3.1 Pro's 30.4.
Coding: In coding, GPT-5.5 scores 74.9 on AA Coding Index compared to Gemini 3.1 Pro's 68.8, while GPT-5.5 scores 1272 on Design Arena ELO compared to Gemini 3.1 Pro's 1256, while GPT-5.5 scores 1269 on Website Arena ELO compared to Gemini 3.1 Pro's 1246.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.4% on GPQA Diamond compared to GPT-5.5's 93.8%, while GPT-5.5 scores 37.3 on AA Agentic Index compared to Gemini 3.1 Pro's 10.3, while GPT-5.5 scores 75.3% on τ²-Bench Airline compared to Gemini 3.1 Pro's 75.3%.
Context: In context, GPT-5.5 scores 1.1M on Context Length compared to Gemini 3.1 Pro's 1.0M.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while GPT-5.5 costs $5.0/1M input and $30.0/1M output. Gemini 3.1 Pro is the more affordable option for API usage.
Verdict
Gemini 3.1 Pro leads across the board in affordability, making it the stronger overall choice in this comparison.
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Gemini 3.1 Pro vs GPT-5.5 — FAQ
Which is better, Gemini 3.1 Pro or GPT-5.5?
GPT-5.5 wins on more benchmarks overall (7 vs 4). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3.1 Pro compare to GPT-5.5 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Gemini 3.1 Pro cheaper than GPT-5.5?
Yes, Gemini 3.1 Pro is cheaper. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens. GPT-5.5 costs $5.0/1M input and $30.0/1M output tokens.
Which is faster, Gemini 3.1 Pro or GPT-5.5?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the Gemini 3.1 Pro vs GPT-5.5 comparison cover?
This comparison covers 11 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Intelligence Index, AA Coding Index, AA Agentic Index, Cached Input Cost, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.