Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mellum2-12B-A2.5B-Instruct
27
MiMo-V2-Flash
59
Pick MiMo-V2-Flash 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
+36.2 difference
Knowledge
+43.6 difference
Mellum2-12B-A2.5B-Instruct
MiMo-V2-Flash
N/A
$0 / $0
N/A
129 t/s
N/A
2.14s
128K
256K
Pick MiMo-V2-Flash 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-Flash is clearly ahead on the provisional aggregate, 59 to 27. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
MiMo-V2-Flash's sharpest advantage is in knowledge, where it averages 84.5 against 40.9. The single biggest benchmark swing on the page is GPQA, 40.9% to 83.7%.
MiMo-V2-Flash 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-Flash gives you the larger context window at 256K, compared with 128K for Mellum2-12B-A2.5B-Instruct.
MiMo-V2-Flash is ahead on BenchLM's provisional leaderboard, 59 to 27. The biggest single separator in this matchup is GPQA, where the scores are 40.9% and 83.7%.
MiMo-V2-Flash has the edge for knowledge tasks in this comparison, averaging 84.5 versus 40.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
MiMo-V2-Flash has the edge for coding in this comparison, averaging 73.4 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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