Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Claude Opus 4.5 is clearly ahead on the aggregate, 85 to 43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in multilingual, where it averages 90 against 87. The single biggest benchmark swing on the page is MMLU, 99 to 82. GPT-4o mini does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Claude Opus 4.5 gives you the larger context window at 200K, compared with 128K for GPT-4o mini.
Pick Claude Opus 4.5 if you want the stronger benchmark profile. GPT-4o mini only becomes the better choice if coding is the priority.
Claude Opus 4.5
80.8
GPT-4o mini
82
Claude Opus 4.5
72
GPT-4o mini
87.2
Claude Opus 4.5
90
GPT-4o mini
87
Claude Opus 4.5 is ahead overall, 85 to 43. The biggest single separator in this matchup is MMLU, where the scores are 99 and 82.
GPT-4o mini has the edge for knowledge tasks in this comparison, averaging 82 versus 80.8. 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 72. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for multilingual tasks in this comparison, averaging 90 versus 87. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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