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-Instruct
27
Verified leaderboard positions: Gemini 3.5 Flash #9 · Mellum2-12B-A2.5B-Instruct unranked
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Instruct only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
Coding
+17.3 difference
Knowledge
+17.1 difference
Inst. Following
+0.5 difference
Gemini 3.5 Flash
Mellum2-12B-A2.5B-Instruct
$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-Instruct only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 87 to 27. 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 coding, where it averages 54.5 against 37.2. The single biggest benchmark swing on the page is GPQA, 92.2% to 40.9%.
Gemini 3.5 Flash is the reasoning model in the pair, while Mellum2-12B-A2.5B-Instruct is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemini 3.5 Flash gives you the larger context window at 1M, compared with 128K for Mellum2-12B-A2.5B-Instruct.
Gemini 3.5 Flash is ahead on BenchLM's provisional leaderboard, 87 to 27. The biggest single separator in this matchup is GPQA, where the scores are 92.2% and 40.9%.
Gemini 3.5 Flash has the edge for knowledge tasks in this comparison, averaging 58 versus 40.9. Inside this category, GPQA-D is the benchmark that creates the most daylight between them.
Gemini 3.5 Flash has the edge for coding in this comparison, averaging 54.5 versus 37.2. Mellum2-12B-A2.5B-Instruct stays close enough that the answer can still flip depending on your workload.
Gemini 3.5 Flash has the edge for instruction following in this comparison, averaging 76.3 versus 75.8. Mellum2-12B-A2.5B-Instruct stays close enough that the answer can still flip depending on your workload.
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