Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Gemini 3 Pro is clearly ahead on the aggregate, 84 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Pro's sharpest advantage is in coding, where it averages 66.3 against 49.3. The single biggest benchmark swing on the page is GPQA, 97 to 77.2. o3-mini does hit back in instruction following, so the answer changes if that is the part of the workload you care about most.
o3-mini is the reasoning model in the pair, while Gemini 3 Pro is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemini 3 Pro gives you the larger context window at 2M, compared with 200K for o3-mini.
Pick Gemini 3 Pro if you want the stronger benchmark profile. o3-mini only becomes the better choice if instruction following is the priority or you want the stronger reasoning-first profile.
Gemini 3 Pro
81.2
o3-mini
82.1
Gemini 3 Pro
66.3
o3-mini
49.3
Gemini 3 Pro
96.4
o3-mini
87.3
Gemini 3 Pro
88
o3-mini
93.9
Gemini 3 Pro is ahead overall, 84 to 56. The biggest single separator in this matchup is GPQA, where the scores are 97 and 77.2.
o3-mini has the edge for knowledge tasks in this comparison, averaging 82.1 versus 81.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Gemini 3 Pro has the edge for coding in this comparison, averaging 66.3 versus 49.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Gemini 3 Pro has the edge for math in this comparison, averaging 96.4 versus 87.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o3-mini has the edge for instruction following in this comparison, averaging 93.9 versus 88. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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