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 65. 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 41.1. The single biggest benchmark swing on the page is SWE-bench Pro, 70 to 43.
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Mercury 2 only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Kimi K2.5 (Reasoning)
73.1
Mercury 2
63.7
Kimi K2.5 (Reasoning)
64.1
Mercury 2
41.1
Kimi K2.5 (Reasoning)
74.3
Mercury 2
68.3
Kimi K2.5 (Reasoning)
84.9
Mercury 2
80.1
Kimi K2.5 (Reasoning)
69.7
Mercury 2
57.2
Kimi K2.5 (Reasoning)
91
Mercury 2
84
Kimi K2.5 (Reasoning)
86.7
Mercury 2
79.7
Kimi K2.5 (Reasoning)
92.6
Mercury 2
80.9
Kimi K2.5 (Reasoning) is ahead overall, 76 to 65. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 70 and 43.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 69.7 versus 57.2. 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 41.1. 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 80.9. Inside this category, AIME 2023 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 80.1. Inside this category, SimpleQA 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 63.7. 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 68.3. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Kimi K2.5 (Reasoning) has the edge for instruction following in this comparison, averaging 91 versus 84. 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 79.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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