Gemini 3.1 Pro vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 10 of 16 benchmarks against o3 by OpenAI, which leads on 4. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Gemini 3.1 Pro scores 1501 on Chatbot Arena ELO compared to o3's 1380, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to o3's 84.0%, while both score 92.0% on IFEval.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to o3's 90.0%, while Gemini 3.1 Pro scores 80.6% on SWE-bench Verified compared to o3's 69.1%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to o3's 70.0%.
Math: In math, o3 scores 96.0% on MATH compared to Gemini 3.1 Pro's 93.0%, while o3 scores 98.5% on GSM8K compared to Gemini 3.1 Pro's 98.0%, while o3 scores 98.4% on AIME 2025 compared to Gemini 3.1 Pro's 95.0%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to o3's 83.3%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to o3's 75.7%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to o3's 200K.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Both models are priced identically for input tokens.
Speed Comparison
Gemini 3.1 Pro generates output at 65 tok/s compared to o3's 40 tok/s, and the time to first token is 420 ms for Gemini 3.1 Pro versus 800 ms for o3. Gemini 3.1 Pro delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and speed, Gemini 3.1 Pro has the edge. For those who value math, o3 is the stronger choice.
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Gemini 3.1 Pro vs o3 — FAQ
Which is better, Gemini 3.1 Pro or o3?
Gemini 3.1 Pro wins on more benchmarks overall (10 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 o3 for coding?
Gemini 3.1 Pro is better for coding, scoring 80.6% on SWE-bench Verified compared to 69.1%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 3.1 Pro cheaper than o3?
Both models are priced the same at $2.0/1M input tokens. Gemini 3.1 Pro output costs $12.0/1M and o3 output costs $8.0/1M.
Which is faster, Gemini 3.1 Pro or o3?
Gemini 3.1 Pro is faster, generating output at 65 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3.1 Pro vs o3 comparison cover?
This comparison covers 16 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.