Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mellum2-12B-A2.5B-Instruct
27
Qwen3.5-122B-A10B
64
Verified leaderboard positions: Mellum2-12B-A2.5B-Instruct unranked · Qwen3.5-122B-A10B #12
Pick Qwen3.5-122B-A10B 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
+34.8 difference
Knowledge
+40.7 difference
Inst. Following
+17.6 difference
Mellum2-12B-A2.5B-Instruct
Qwen3.5-122B-A10B
N/A
$0 / $0
N/A
N/A
N/A
N/A
128K
262K
Pick Qwen3.5-122B-A10B 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.
Qwen3.5-122B-A10B is clearly ahead on the provisional aggregate, 64 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Qwen3.5-122B-A10B's sharpest advantage is in knowledge, where it averages 81.6 against 40.9. The single biggest benchmark swing on the page is GPQA, 40.9% to 86.6%.
Qwen3.5-122B-A10B 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. Qwen3.5-122B-A10B gives you the larger context window at 262K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
Qwen3.5-122B-A10B is ahead on BenchLM's provisional leaderboard, 64 to 27. The biggest single separator in this matchup is GPQA, where the scores are 40.9% and 86.6%.
Qwen3.5-122B-A10B has the edge for knowledge tasks in this comparison, averaging 81.6 versus 40.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Qwen3.5-122B-A10B has the edge for coding in this comparison, averaging 72 versus 37.2. Mellum2-12B-A2.5B-Instruct stays close enough that the answer can still flip depending on your workload.
Qwen3.5-122B-A10B has the edge for instruction following in this comparison, averaging 93.4 versus 75.8. Inside this category, IFEval is the benchmark that creates the most daylight between them.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.