Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemma 4 31B
74
Grok 4.20
78
Pick Grok 4.20 if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if multimodal & grounded is the priority or you want the cheaper token bill.
Multimodal
+1.7 difference
Gemma 4 31B
Grok 4.20
$0 / $0
$2 / $6
N/A
233 t/s
N/A
10.33s
256K
2M
Pick Grok 4.20 if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if multimodal & grounded is the priority or you want the cheaper token bill.
Grok 4.20 is clearly ahead on the provisional aggregate, 78 to 74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.20 is also the more expensive model on tokens at $2.00 input / $6.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Gemma 4 31B. That is roughly Infinityx on output cost alone. Grok 4.20 gives you the larger context window at 2M, compared with 256K for Gemma 4 31B.
Grok 4.20 is ahead on BenchLM's provisional leaderboard, 78 to 74. The biggest single separator in this matchup is HLE w/o tools, where the scores are 19.5% and 31.6%.
Gemma 4 31B has the edge for multimodal and grounded tasks in this comparison, averaging 76.9 versus 75.2. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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