Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude 3.5 Sonnet
40
Mellum2-12B-A2.5B-Instruct
27
Pick Claude 3.5 Sonnet 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
+11.8 difference
Knowledge
+18.5 difference
Claude 3.5 Sonnet
Mellum2-12B-A2.5B-Instruct
$3 / $15
N/A
N/A
N/A
N/A
N/A
200K
128K
Pick Claude 3.5 Sonnet 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.
Claude 3.5 Sonnet is clearly ahead on the provisional aggregate, 40 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude 3.5 Sonnet's sharpest advantage is in knowledge, where it averages 59.4 against 40.9. The single biggest benchmark swing on the page is GPQA, 59.4% to 40.9%.
Claude 3.5 Sonnet gives you the larger context window at 200K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
Claude 3.5 Sonnet is ahead on BenchLM's provisional leaderboard, 40 to 27. The biggest single separator in this matchup is GPQA, where the scores are 59.4% and 40.9%.
Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 59.4 versus 40.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for coding in this comparison, averaging 49 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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