Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Gemini 2.5 Flash is clearly ahead on the aggregate, 49 to 43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 2.5 Flash gives you the larger context window at 1M, compared with 128K for GPT-4o mini.
Pick Gemini 2.5 Flash if you want the stronger benchmark profile. GPT-4o mini only becomes the better choice if coding is the priority.
Gemini 2.5 Flash
42.7
GPT-4o mini
82
Gemini 2.5 Flash
27.7
GPT-4o mini
87.2
Gemini 2.5 Flash
74
GPT-4o mini
87
Gemini 2.5 Flash is ahead overall, 49 to 43. The biggest single separator in this matchup is HumanEval, where the scores are 42 and 87.2.
GPT-4o mini has the edge for knowledge tasks in this comparison, averaging 82 versus 42.7. Inside this category, MMLU is the benchmark that creates the most daylight between them.
GPT-4o mini has the edge for coding in this comparison, averaging 87.2 versus 27.7. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
GPT-4o mini has the edge for multilingual tasks in this comparison, averaging 87 versus 74. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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