Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Kimi K2.5 (Reasoning) is clearly ahead on the aggregate, 82 to 51. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Kimi K2.5 (Reasoning)'s sharpest advantage is in coding, where it averages 69 against 41. The single biggest benchmark swing on the page is SWE-bench Verified, 65 to 41. o1 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o1 gives you the larger context window at 200K, compared with 128K for Kimi K2.5 (Reasoning).
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
Kimi K2.5 (Reasoning)
77.3
o1
83.8
Kimi K2.5 (Reasoning)
69
o1
41
Kimi K2.5 (Reasoning)
92.9
o1
74.3
Kimi K2.5 (Reasoning)
91
o1
92.2
Kimi K2.5 (Reasoning) is ahead overall, 82 to 51. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 65 and 41.
o1 has the edge for knowledge tasks in this comparison, averaging 83.8 versus 77.3. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 69 versus 41. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for math in this comparison, averaging 92.9 versus 74.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o1 has the edge for instruction following in this comparison, averaging 92.2 versus 91. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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