Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Gemini 2.5 Pro is clearly ahead on the aggregate, 72 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 2.5 Pro's sharpest advantage is in coding, where it averages 52.3 against 49.3. The single biggest benchmark swing on the page is IFEval, 83 to 93.9. o3-mini does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Gemini 2.5 Pro is also the more expensive model on tokens at $1.25 input / $5.00 output per 1M tokens, versus $1.10 input / $4.40 output per 1M tokens for o3-mini. o3-mini is the reasoning model in the pair, while Gemini 2.5 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 2.5 Pro gives you the larger context window at 1M, compared with 200K for o3-mini.
Pick Gemini 2.5 Pro if you want the stronger benchmark profile. o3-mini only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Gemini 2.5 Pro
67.5
o3-mini
82.1
Gemini 2.5 Pro
52.3
o3-mini
49.3
Gemini 2.5 Pro
83.1
o3-mini
87.3
Gemini 2.5 Pro
83
o3-mini
93.9
Gemini 2.5 Pro is ahead overall, 72 to 56. The biggest single separator in this matchup is IFEval, where the scores are 83 and 93.9.
o3-mini has the edge for knowledge tasks in this comparison, averaging 82.1 versus 67.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Gemini 2.5 Pro has the edge for coding in this comparison, averaging 52.3 versus 49.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
o3-mini has the edge for math in this comparison, averaging 87.3 versus 83.1. 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 83. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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