Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
76
Gemini 3 Pro
81
Verified leaderboard positions: Claude Opus 4.5 #13 · Gemini 3 Pro unranked
Pick Gemini 3 Pro if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning is the priority.
Reasoning
+33.3 difference
Multimodal
+11.1 difference
Claude Opus 4.5
Gemini 3 Pro
$5 / $25
$2 / $12
46 t/s
109 t/s
1.01s
32.65s
200K
2M
Pick Gemini 3 Pro if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning is the priority.
Gemini 3 Pro is clearly ahead on the provisional aggregate, 81 to 76. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Pro's sharpest advantage is in multimodal & grounded, where it averages 81.1 against 70. The single biggest benchmark swing on the page is CharXiv, 68.5% to 81.4%. Claude Opus 4.5 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.
Claude Opus 4.5 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $2.00 input / $12.00 output per 1M tokens for Gemini 3 Pro. That is roughly 2.1x on output cost alone. Gemini 3 Pro gives you the larger context window at 2M, compared with 200K for Claude Opus 4.5.
Gemini 3 Pro is ahead on BenchLM's provisional leaderboard, 81 to 76. The biggest single separator in this matchup is CharXiv, where the scores are 68.5% and 81.4%.
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 31.1. Inside this category, CritPt is the benchmark that creates the most daylight between them.
Gemini 3 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 81.1 versus 70. Inside this category, ScreenSpot Pro is the benchmark that creates the most daylight between them.
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