Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemma 4 12B
53
Mellum2-12B-A2.5B-Thinking
59
Pick Mellum2-12B-A2.5B-Thinking if you want the stronger benchmark profile. Gemma 4 12B only becomes the better choice if knowledge is the priority or you need the larger 256K context window.
Coding
+2.1 difference
Knowledge
+20.2 difference
Gemma 4 12B
Mellum2-12B-A2.5B-Thinking
N/A
N/A
N/A
N/A
N/A
N/A
256K
128K
Pick Mellum2-12B-A2.5B-Thinking if you want the stronger benchmark profile. Gemma 4 12B only becomes the better choice if knowledge is the priority or you need the larger 256K context window.
Mellum2-12B-A2.5B-Thinking is clearly ahead on the provisional aggregate, 59 to 53. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemma 4 12B gives you the larger context window at 256K, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Mellum2-12B-A2.5B-Thinking is ahead on BenchLM's provisional leaderboard, 59 to 53. The biggest single separator in this matchup is GPQA, where the scores are 78.8% and 57.6%.
Gemma 4 12B has the edge for knowledge tasks in this comparison, averaging 77.8 versus 57.6. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Gemma 4 12B has the edge for coding in this comparison, averaging 72 versus 69.9. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
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