Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mellum2-12B-A2.5B-Instruct
27
MiMo-V2-Omni
83
Pick MiMo-V2-Omni 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
+37.6 difference
Mellum2-12B-A2.5B-Instruct
MiMo-V2-Omni
N/A
N/A
N/A
N/A
N/A
N/A
128K
262K
Pick MiMo-V2-Omni 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.
MiMo-V2-Omni is clearly ahead on the provisional aggregate, 83 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
MiMo-V2-Omni's sharpest advantage is in coding, where it averages 74.8 against 37.2.
MiMo-V2-Omni 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. MiMo-V2-Omni gives you the larger context window at 262K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
MiMo-V2-Omni is ahead on BenchLM's provisional leaderboard, 83 to 27.
MiMo-V2-Omni has the edge for coding in this comparison, averaging 74.8 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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