Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
LongCat-2.0
80
Mellum2-12B-A2.5B-Thinking
58
Pick LongCat-2.0 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Coding
+10.4 difference
LongCat-2.0
Mellum2-12B-A2.5B-Thinking
$0.75 / $2.95
N/A
N/A
N/A
N/A
N/A
1M
128K
Pick LongCat-2.0 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
LongCat-2.0 is clearly ahead on the provisional aggregate, 80 to 58. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
LongCat-2.0 gives you the larger context window at 1M, compared with 128K for Mellum2-12B-A2.5B-Thinking.
LongCat-2.0 is ahead on BenchLM's provisional leaderboard, 80 to 58.
Mellum2-12B-A2.5B-Thinking has the edge for coding in this comparison, averaging 69.9 versus 59.5. LongCat-2.0 stays close enough that the answer can still flip depending on your workload.
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