Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.5 Flash
87
Mellum2-12B-A2.5B-Thinking
59
Verified leaderboard positions: Gemini 3.5 Flash #9 · Mellum2-12B-A2.5B-Thinking unranked
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Coding
+15.4 difference
Knowledge
+0.4 difference
Inst. Following
+0.2 difference
Gemini 3.5 Flash
Mellum2-12B-A2.5B-Thinking
$1.5 / $9
N/A
284.2 t/s
N/A
18.55s
N/A
1M
128K
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 87 to 59. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3.5 Flash's sharpest advantage is in knowledge, where it averages 58 against 57.6. The single biggest benchmark swing on the page is GPQA, 92.2% to 57.6%. Mellum2-12B-A2.5B-Thinking does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Gemini 3.5 Flash gives you the larger context window at 1M, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Gemini 3.5 Flash is ahead on BenchLM's provisional leaderboard, 87 to 59. The biggest single separator in this matchup is GPQA, where the scores are 92.2% and 57.6%.
Gemini 3.5 Flash has the edge for knowledge tasks in this comparison, averaging 58 versus 57.6. Inside this category, GPQA-D is the benchmark that creates the most daylight between them.
Mellum2-12B-A2.5B-Thinking has the edge for coding in this comparison, averaging 69.9 versus 54.5. Gemini 3.5 Flash stays close enough that the answer can still flip depending on your workload.
Mellum2-12B-A2.5B-Thinking has the edge for instruction following in this comparison, averaging 76.5 versus 76.3. Gemini 3.5 Flash stays close enough that the answer can still flip depending on your workload.
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