Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 2.5 Pro
64
Mellum2-12B-A2.5B-Instruct
27
Pick Gemini 2.5 Pro if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Instruct only becomes the better choice if knowledge is the priority.
Coding
+26.6 difference
Knowledge
+0.1 difference
Gemini 2.5 Pro
Mellum2-12B-A2.5B-Instruct
$1.25 / $10
N/A
117 t/s
N/A
21.19s
N/A
1M
128K
Pick Gemini 2.5 Pro if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Instruct only becomes the better choice if knowledge is the priority.
Gemini 2.5 Pro is clearly ahead on the provisional aggregate, 64 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 2.5 Pro's sharpest advantage is in coding, where it averages 63.8 against 37.2. The single biggest benchmark swing on the page is GPQA, 83% to 40.9%. Mellum2-12B-A2.5B-Instruct does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Gemini 2.5 Pro gives you the larger context window at 1M, compared with 128K for Mellum2-12B-A2.5B-Instruct.
Gemini 2.5 Pro is ahead on BenchLM's provisional leaderboard, 64 to 27. The biggest single separator in this matchup is GPQA, where the scores are 83% and 40.9%.
Mellum2-12B-A2.5B-Instruct has the edge for knowledge tasks in this comparison, averaging 40.9 versus 40.8. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Gemini 2.5 Pro has the edge for coding in this comparison, averaging 63.8 versus 37.2. Mellum2-12B-A2.5B-Instruct stays close enough that the answer can still flip depending on your workload.
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