Gemini 3.1 Pro vs o3 Mini
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 9 of 14 benchmarks against o3 Mini 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 Mini's 1320, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to o3 Mini's 78.0%.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to o3 Mini's 87.0%, while Gemini 3.1 Pro scores 80.6% on SWE-bench Verified compared to o3 Mini's 50.0%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to o3 Mini's 55.0%.
Math: In math, both score 93.0% on MATH, while Gemini 3.1 Pro scores 98.0% on GSM8K compared to o3 Mini's 97.0%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to o3 Mini's 77.0%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to o3 Mini's 45.0%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to o3 Mini's 200K.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while o3 Mini costs $1.1/1M input and $4.4/1M output. o3 Mini is the more affordable option for API usage.
Speed Comparison
Gemini 3.1 Pro generates output at 65 tok/s compared to o3 Mini's 100 tok/s, and the time to first token is 420 ms for Gemini 3.1 Pro versus 400 ms for o3 Mini. o3 Mini delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence, Gemini 3.1 Pro has the edge. For those who value affordability and speed, o3 Mini is the stronger choice.
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Gemini 3.1 Pro vs o3 Mini — FAQ
Which is better, Gemini 3.1 Pro or o3 Mini?
Gemini 3.1 Pro wins on more benchmarks overall (9 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 Mini for coding?
Gemini 3.1 Pro is better for coding, scoring 80.6% on SWE-bench Verified compared to 50.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 3.1 Pro cheaper than o3 Mini?
Yes, o3 Mini is cheaper. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens. o3 Mini costs $1.1/1M input and $4.4/1M output tokens.
Which is faster, Gemini 3.1 Pro or o3 Mini?
o3 Mini is faster, generating output at 100 tok/s compared to 65 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3.1 Pro vs o3 Mini comparison cover?
This comparison covers 14 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.