Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.5 Flash
87
Gemini 3 Pro Deep Think
90
Verified leaderboard positions: Gemini 3.5 Flash #6 · 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 has the cleaner provisional overall profile here, landing at 90 versus 87. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
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, 90 to 87. 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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