Gemini 2.5 Pro vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
o3 by OpenAI wins on 13 of 20 benchmarks against Gemini 2.5 Pro by Google, which leads on 6. 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 2.5 Pro scores 1465 on Chatbot Arena ELO compared to o3's 1380, while both score 84.0% on MMLU-Pro, while o3 scores 9.5 on MT-Bench compared to Gemini 2.5 Pro's 9.3, while o3 scores 92.0% on IFEval compared to Gemini 2.5 Pro's 88.0%, while o3 scores 86.0% on TruthfulQA compared to Gemini 2.5 Pro's 84.8%.
Coding: In coding, o3 scores 90.0% on HumanEval+ compared to Gemini 2.5 Pro's 89.0%, while o3 scores 69.1% on SWE-bench Verified compared to Gemini 2.5 Pro's 63.8%, while o3 scores 70.0% on LiveCodeBench compared to Gemini 2.5 Pro's 58.0%.
Math: In math, o3 scores 96.0% on MATH compared to Gemini 2.5 Pro's 88.0%, while o3 scores 98.5% on GSM8K compared to Gemini 2.5 Pro's 95.5%.
Reasoning: In reasoning, Gemini 2.5 Pro scores 84.0% on GPQA Diamond compared to o3's 83.3%, while o3 scores 75.7% on ARC-AGI compared to Gemini 2.5 Pro's 48.0%, while o3 scores 95.8% on BBH compared to Gemini 2.5 Pro's 94.5%, while o3 scores 94.0% on Winogrande compared to Gemini 2.5 Pro's 92.0%.
Context: In context, Gemini 2.5 Pro scores 1.0M on Context Length compared to o3's 200K.
Multimodal: In multimodal, o3 scores 86.8% on MathVista compared to Gemini 2.5 Pro's 80.4%.
Pricing Comparison
Gemini 2.5 Pro costs $1.3/1M input tokens and $10.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Gemini 2.5 Pro is the more affordable option for API usage.
Speed Comparison
Gemini 2.5 Pro generates output at 55 tok/s compared to o3's 40 tok/s, and the time to first token is 500 ms for Gemini 2.5 Pro versus 800 ms for o3. Gemini 2.5 Pro delivers faster throughput.
Verdict
For developers prioritizing general intelligence and affordability and speed, Gemini 2.5 Pro has the edge. For those who value coding and math, o3 is the stronger choice.
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Gemini 2.5 Pro vs o3 — FAQ
Which is better, Gemini 2.5 Pro or o3?
o3 wins on more benchmarks overall (13 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 2.5 Pro compare to o3 for coding?
o3 is better for coding, scoring 69.1% on SWE-bench Verified compared to 63.8%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 2.5 Pro cheaper than o3?
Yes, Gemini 2.5 Pro is cheaper. Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Gemini 2.5 Pro or o3?
Gemini 2.5 Pro is faster, generating output at 55 tok/s compared to 40 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 2.5 Pro vs o3 comparison cover?
This comparison covers 20 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MT-Bench, IFEval, MATH, TruthfulQA, SWE-bench Verified, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.