Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mellum2-12B-A2.5B-Thinking
59
o1-pro
28
Pick Mellum2-12B-A2.5B-Thinking if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
Knowledge
+21.4 difference
Mellum2-12B-A2.5B-Thinking
o1-pro
N/A
$150 / $600
N/A
N/A
N/A
N/A
128K
200K
Pick Mellum2-12B-A2.5B-Thinking if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
Mellum2-12B-A2.5B-Thinking is clearly ahead on the provisional aggregate, 59 to 28. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1-pro gives you the larger context window at 200K, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Mellum2-12B-A2.5B-Thinking is ahead on BenchLM's provisional leaderboard, 59 to 28. The biggest single separator in this matchup is GPQA, where the scores are 57.6% and 79%.
o1-pro has the edge for knowledge tasks in this comparison, averaging 79 versus 57.6. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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