Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Kimi K2.5 (Reasoning) is clearly ahead on the aggregate, 76 to 58. 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 64.1 against 33.2. The single biggest benchmark swing on the page is SWE-bench Pro, 70 to 37. Aion-2.0 does hit back in instruction following, so the answer changes if that is the part of the workload you care about most.
Kimi K2.5 (Reasoning) is the reasoning model in the pair, while Aion-2.0 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Aion-2.0 only becomes the better choice if instruction following is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Kimi K2.5 (Reasoning)
73.1
Aion-2.0
51.7
Kimi K2.5 (Reasoning)
64.1
Aion-2.0
33.2
Kimi K2.5 (Reasoning)
74.3
Aion-2.0
66
Kimi K2.5 (Reasoning)
84.9
Aion-2.0
70.3
Kimi K2.5 (Reasoning)
69.7
Aion-2.0
54
Kimi K2.5 (Reasoning)
91
Aion-2.0
93
Kimi K2.5 (Reasoning)
86.7
Aion-2.0
78.1
Kimi K2.5 (Reasoning)
92.6
Aion-2.0
72.1
Kimi K2.5 (Reasoning) is ahead overall, 76 to 58. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 70 and 37.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 69.7 versus 54. Inside this category, HLE is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for coding in this comparison, averaging 64.1 versus 33.2. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for math in this comparison, averaging 92.6 versus 72.1. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for reasoning in this comparison, averaging 84.9 versus 70.3. Inside this category, LongBench v2 is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for agentic tasks in this comparison, averaging 73.1 versus 51.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for multimodal and grounded tasks in this comparison, averaging 74.3 versus 66. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for instruction following in this comparison, averaging 93 versus 91. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for multilingual tasks in this comparison, averaging 86.7 versus 78.1. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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