Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.20
72
Mellum2-12B-A2.5B-Thinking
59
Pick Grok 4.20 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Coding
+8.9 difference
Grok 4.20
Mellum2-12B-A2.5B-Thinking
$2 / $6
N/A
233 t/s
N/A
10.33s
N/A
2M
128K
Pick Grok 4.20 if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Grok 4.20 is clearly ahead on the provisional aggregate, 72 to 59. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.20 gives you the larger context window at 2M, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Grok 4.20 is ahead on BenchLM's provisional leaderboard, 72 to 59.
Mellum2-12B-A2.5B-Thinking has the edge for coding in this comparison, averaging 69.9 versus 61. Grok 4.20 stays close enough that the answer can still flip depending on your workload.
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