Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5 (high) 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.
GPT-5 (high)'s sharpest advantage is in coding, where it averages 71.3 against 49.3. The single biggest benchmark swing on the page is SWE-bench Verified, 67 to 49.3. o3-mini does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o3-mini gives you the larger context window at 200K, compared with 128K for GPT-5 (high).
Pick GPT-5 (high) if you want the stronger benchmark profile. o3-mini only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
GPT-5 (high)
78.3
o3-mini
82.1
GPT-5 (high)
71.3
o3-mini
49.3
GPT-5 (high)
94
o3-mini
87.3
GPT-5 (high)
91
o3-mini
93.9
GPT-5 (high) is ahead overall, 84 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 67 and 49.3.
o3-mini has the edge for knowledge tasks in this comparison, averaging 82.1 versus 78.3. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-5 (high) has the edge for coding in this comparison, averaging 71.3 versus 49.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
GPT-5 (high) has the edge for math in this comparison, averaging 94 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 91. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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