Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-4.1
57
Mellum2-12B-A2.5B-Instruct
27
Pick GPT-4.1 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Instruct only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Coding
+17.4 difference
Knowledge
+25.4 difference
Inst. Following
+11.6 difference
GPT-4.1
Mellum2-12B-A2.5B-Instruct
$2 / $8
N/A
108 t/s
N/A
1.02s
N/A
1M
128K
Pick GPT-4.1 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Instruct only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
GPT-4.1 is clearly ahead on the provisional aggregate, 57 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-4.1's sharpest advantage is in knowledge, where it averages 66.3 against 40.9. The single biggest benchmark swing on the page is GPQA, 66.3% to 40.9%.
GPT-4.1 gives you the larger context window at 1M, compared with 128K for Mellum2-12B-A2.5B-Instruct.
GPT-4.1 is ahead on BenchLM's provisional leaderboard, 57 to 27. The biggest single separator in this matchup is GPQA, where the scores are 66.3% and 40.9%.
GPT-4.1 has the edge for knowledge tasks in this comparison, averaging 66.3 versus 40.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-4.1 has the edge for coding in this comparison, averaging 54.6 versus 37.2. Mellum2-12B-A2.5B-Instruct stays close enough that the answer can still flip depending on your workload.
GPT-4.1 has the edge for instruction following in this comparison, averaging 87.4 versus 75.8. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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