Gemini 3 Pro vs GPT-5.1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 9 of 16 benchmarks against Gemini 3 Pro by Google, which leads on 6. 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, Gemini 3 Pro scores 1492 on Chatbot Arena ELO compared to GPT-5.1's 1464, while Gemini 3 Pro scores 89.8% on MMLU-Pro compared to GPT-5.1's 86.0%, while both score 91.0% on IFEval.
Coding: In coding, GPT-5.1 scores 93.0% on HumanEval+ compared to Gemini 3 Pro's 91.0%, while GPT-5.1 scores 76.3% on SWE-bench Verified compared to Gemini 3 Pro's 65.0%, while GPT-5.1 scores 82.0% on LiveCodeBench compared to Gemini 3 Pro's 72.0%.
Math: In math, GPT-5.1 scores 95.0% on MATH compared to Gemini 3 Pro's 92.0%, while GPT-5.1 scores 98.5% on GSM8K compared to Gemini 3 Pro's 97.5%, while Gemini 3 Pro scores 95.0% on AIME 2025 compared to GPT-5.1's 94.0%.
Reasoning: In reasoning, Gemini 3 Pro scores 91.9% on GPQA Diamond compared to GPT-5.1's 88.1%, while Gemini 3 Pro scores 54.0% on ARC-AGI compared to GPT-5.1's 50.0%.
Context: In context, Gemini 3 Pro scores 1.0M on Context Length compared to GPT-5.1's 400K.
Pricing Comparison
Gemini 3 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while GPT-5.1 costs $1.3/1M input and $10.0/1M output. GPT-5.1 is the more affordable option for API usage.
Speed Comparison
Gemini 3 Pro generates output at 60 tok/s compared to GPT-5.1's 95 tok/s, and the time to first token is 450 ms for Gemini 3 Pro versus 350 ms for GPT-5.1. GPT-5.1 delivers faster throughput.
Verdict
For developers prioritizing general intelligence, Gemini 3 Pro has the edge. For those who value coding and math and affordability and speed, GPT-5.1 is the stronger choice.
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Gemini 3 Pro vs GPT-5.1 — FAQ
Which is better, Gemini 3 Pro or GPT-5.1?
GPT-5.1 wins on more benchmarks overall (9 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3 Pro compare to GPT-5.1 for coding?
GPT-5.1 is better for coding, scoring 76.3% on SWE-bench Verified compared to 65.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 3 Pro cheaper than GPT-5.1?
Yes, GPT-5.1 is cheaper. Gemini 3 Pro costs $2.0/1M input and $12.0/1M output tokens. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, Gemini 3 Pro or GPT-5.1?
GPT-5.1 is faster, generating output at 95 tok/s compared to 60 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3 Pro vs GPT-5.1 comparison cover?
This comparison covers 16 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.