Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Kimi K2.5 (Reasoning)
76
Mellum2-12B-A2.5B-Thinking
59
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Coding
+6.9 difference
Knowledge
+29.7 difference
Kimi K2.5 (Reasoning)
Mellum2-12B-A2.5B-Thinking
$0.6 / $3
N/A
N/A
N/A
N/A
N/A
128K
128K
Pick Kimi K2.5 (Reasoning) if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Kimi K2.5 (Reasoning) is clearly ahead on the provisional aggregate, 76 to 59. 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 knowledge, where it averages 87.3 against 57.6. The single biggest benchmark swing on the page is GPQA, 87.6% to 57.6%.
Kimi K2.5 (Reasoning) is ahead on BenchLM's provisional leaderboard, 76 to 59. The biggest single separator in this matchup is GPQA, where the scores are 87.6% and 57.6%.
Kimi K2.5 (Reasoning) has the edge for knowledge tasks in this comparison, averaging 87.3 versus 57.6. 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 76.8 versus 69.9. Mellum2-12B-A2.5B-Thinking stays close enough that the answer can still flip depending on your workload.
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