Gemini 3 Pro vs o3 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3 Pro by Google wins on 8 of 15 benchmarks against o3 Pro by OpenAI, which leads on 7. 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 o3 Pro's 1410, while Gemini 3 Pro scores 89.8% on MMLU-Pro compared to o3 Pro's 86.0%.
Coding: In coding, o3 Pro scores 92.0% on HumanEval+ compared to Gemini 3 Pro's 91.0%, while o3 Pro scores 70.0% on SWE-bench Verified compared to Gemini 3 Pro's 65.0%, while o3 Pro scores 75.0% on LiveCodeBench compared to Gemini 3 Pro's 72.0%.
Math: In math, o3 Pro scores 97.0% on MATH compared to Gemini 3 Pro's 92.0%, while o3 Pro scores 99.0% on GSM8K compared to Gemini 3 Pro's 97.5%, while o3 Pro scores 98.4% on AIME 2025 compared to Gemini 3 Pro's 95.0%.
Reasoning: In reasoning, Gemini 3 Pro scores 91.9% on GPQA Diamond compared to o3 Pro's 85.0%, while o3 Pro scores 70.0% on ARC-AGI compared to Gemini 3 Pro's 54.0%.
Context: In context, Gemini 3 Pro scores 1.0M on Context Length compared to o3 Pro's 200K.
Pricing Comparison
Gemini 3 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while o3 Pro costs $20.0/1M input and $80.0/1M output. Gemini 3 Pro is the more affordable option for API usage.
Speed Comparison
Gemini 3 Pro generates output at 60 tok/s compared to o3 Pro's 25 tok/s, and the time to first token is 450 ms for Gemini 3 Pro versus 1200 ms for o3 Pro. Gemini 3 Pro delivers faster throughput.
Verdict
For developers prioritizing general intelligence and affordability and speed, Gemini 3 Pro has the edge. For those who value coding and math, o3 Pro is the stronger choice.
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Gemini 3 Pro vs o3 Pro — FAQ
Which is better, Gemini 3 Pro or o3 Pro?
Gemini 3 Pro wins on more benchmarks overall (8 vs 7). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3 Pro compare to o3 Pro for coding?
o3 Pro is better for coding, scoring 70.0% 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 o3 Pro?
Yes, Gemini 3 Pro is cheaper. Gemini 3 Pro costs $2.0/1M input and $12.0/1M output tokens. o3 Pro costs $20.0/1M input and $80.0/1M output tokens.
Which is faster, Gemini 3 Pro or o3 Pro?
Gemini 3 Pro is faster, generating output at 60 tok/s compared to 25 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3 Pro vs o3 Pro comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.