Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.5 Flash
81
Gemini 3 Pro Deep Think
88
Verified leaderboard positions: Gemini 3.5 Flash #9 · Gemini 3 Pro Deep Think unranked
Pick Gemini 3 Pro Deep Think if you want the stronger benchmark profile. Gemini 3.5 Flash only becomes the better choice if reasoning is the priority.
Reasoning
+29.6 difference
Gemini 3.5 Flash
Gemini 3 Pro Deep Think
$1.5 / $9
$null / $null
284.2 t/s
N/A
18.55s
N/A
1M
2M
Pick Gemini 3 Pro Deep Think if you want the stronger benchmark profile. Gemini 3.5 Flash only becomes the better choice if reasoning is the priority.
Gemini 3 Pro Deep Think is clearly ahead on the provisional aggregate, 88 to 81. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Pro Deep Think gives you the larger context window at 2M, compared with 1M for Gemini 3.5 Flash.
Gemini 3 Pro Deep Think is ahead on BenchLM's provisional leaderboard, 88 to 81. The biggest single separator in this matchup is ARC-AGI-2, where the scores are 72.1% and 45.1%.
Gemini 3.5 Flash has the edge for reasoning in this comparison, averaging 74.7 versus 45.1. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.
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