Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3 Pro Deep Think
89
GPT-5.5
89
Verified leaderboard positions: Gemini 3 Pro Deep Think unranked · GPT-5.5 #7
Treat this as a split decision. Gemini 3 Pro Deep Think makes more sense if you need the larger 2M context window; GPT-5.5 is the better fit if reasoning is the priority.
Reasoning
+39.9 difference
Gemini 3 Pro Deep Think
GPT-5.5
$null / $null
$5 / $30
N/A
N/A
N/A
N/A
2M
1M
Treat this as a split decision. Gemini 3 Pro Deep Think makes more sense if you need the larger 2M context window; GPT-5.5 is the better fit if reasoning is the priority.
Gemini 3 Pro Deep Think and GPT-5.5 finish on the same provisional overall score, so this is less about a single winner and more about where the edge shows up. The provisional headline says tie; the benchmark table is where the real choice happens.
Gemini 3 Pro Deep Think gives you the larger context window at 2M, compared with 1M for GPT-5.5.
Gemini 3 Pro Deep Think and GPT-5.5 are tied on the provisional overall score, so the right pick depends on which category matters most for your use case.
GPT-5.5 has the edge for reasoning in this comparison, averaging 85 versus 45.1. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.
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