Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-4.1 is clearly ahead on the aggregate, 43 to 35. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-4.1's sharpest advantage is in knowledge, where it averages 78.3 against 28.8. The single biggest benchmark swing on the page is MMLU, 90.2 to 32. Kimi K2 does hit back in mathematics, so the answer changes if that is the part of the workload you care about most.
GPT-4.1 gives you the larger context window at 1M, compared with 128K for Kimi K2.
Pick GPT-4.1 if you want the stronger benchmark profile. Kimi K2 only becomes the better choice if mathematics is the priority.
GPT-4.1
78.3
Kimi K2
28.8
GPT-4.1
54.6
Kimi K2
17
GPT-4.1
26.4
Kimi K2
34.3
GPT-4.1
87.4
Kimi K2
67
GPT-4.1 is ahead overall, 43 to 35. The biggest single separator in this matchup is MMLU, where the scores are 90.2 and 32.
GPT-4.1 has the edge for knowledge tasks in this comparison, averaging 78.3 versus 28.8. Inside this category, MMLU is the benchmark that creates the most daylight between them.
GPT-4.1 has the edge for coding in this comparison, averaging 54.6 versus 17. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Kimi K2 has the edge for math in this comparison, averaging 34.3 versus 26.4. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
GPT-4.1 has the edge for instruction following in this comparison, averaging 87.4 versus 67. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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