Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Kimi K2.5 (Reasoning) is clearly ahead on the aggregate, 82 to 31. 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 mathematics, where it averages 92.9 against 85.2. The single biggest benchmark swing on the page is GPQA, 90 to 71.2.
GPT-5 nano gives you the larger context window at 400K, compared with 128K for Kimi K2.5 (Reasoning).
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. GPT-5 nano only becomes the better choice if you need the larger 400K context window.
Kimi K2.5 (Reasoning)
77.3
GPT-5 nano
71.2
Kimi K2.5 (Reasoning)
92.9
GPT-5 nano
85.2
Kimi K2.5 (Reasoning) is ahead overall, 82 to 31. The biggest single separator in this matchup is GPQA, where the scores are 90 and 71.2.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 77.3 versus 71.2. Inside this category, GPQA 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 85.2. Inside this category, AIME 2025 is the benchmark that creates the most daylight between them.
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