Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
80
Gemma 4 31B
74
Verified leaderboard positions: Claude Opus 4.5 #5 · Gemma 4 31B unranked
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if multimodal & grounded is the priority or you need the larger 256K context window.
Knowledge
+4.9 difference
Multimodal
+6.3 difference
Claude Opus 4.5
Gemma 4 31B
$null / $null
$0 / $0
46 t/s
N/A
1.01s
N/A
200K
256K
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Gemma 4 31B only becomes the better choice if multimodal & grounded is the priority or you need the larger 256K context window.
Claude Opus 4.5 is clearly ahead on the provisional aggregate, 80 to 74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in knowledge, where it averages 66.2 against 61.3. The single biggest benchmark swing on the page is MMMU-Pro, 70.6% to 76.9%. Gemma 4 31B does hit back in multimodal & grounded, so the answer changes if that is the part of the workload you care about most.
Gemma 4 31B is the reasoning model in the pair, while Claude Opus 4.5 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. Gemma 4 31B gives you the larger context window at 256K, compared with 200K for Claude Opus 4.5.
Claude Opus 4.5 is ahead on BenchLM's provisional leaderboard, 80 to 74. The biggest single separator in this matchup is MMMU-Pro, where the scores are 70.6% and 76.9%.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 66.2 versus 61.3. Inside this category, HLE is the benchmark that creates the most daylight between them.
Gemma 4 31B has the edge for multimodal and grounded tasks in this comparison, averaging 76.9 versus 70.6. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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