Head-to-head comparison across 5benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.5 Flash
88
GPT-5.2
80
Verified leaderboard positions: Gemini 3.5 Flash #7 · GPT-5.2 unranked
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. GPT-5.2 only becomes the better choice if knowledge is the priority.
Agentic
+22.0 difference
Coding
+10.2 difference
Reasoning
+21.8 difference
Knowledge
+34.4 difference
Multimodal
+3.5 difference
Gemini 3.5 Flash
GPT-5.2
$1.5 / $9
$1.75 / $14
284.2 t/s
73 t/s
18.55s
130.34s
1M
400K
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. GPT-5.2 only becomes the better choice if knowledge is the priority.
Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 88 to 80. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3.5 Flash's sharpest advantage is in agentic, where it averages 77.2 against 55.2. The single biggest benchmark swing on the page is OSWorld-Verified, 78.4% to 47.3%. GPT-5.2 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
GPT-5.2 is also the more expensive model on tokens at $1.75 input / $14.00 output per 1M tokens, versus $1.50 input / $9.00 output per 1M tokens for Gemini 3.5 Flash. Gemini 3.5 Flash gives you the larger context window at 1M, compared with 400K for GPT-5.2.
Gemini 3.5 Flash is ahead on BenchLM's provisional leaderboard, 88 to 80. The biggest single separator in this matchup is OSWorld-Verified, where the scores are 78.4% and 47.3%.
GPT-5.2 has the edge for knowledge tasks in this comparison, averaging 92.4 versus 58. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-5.2 has the edge for coding in this comparison, averaging 64.7 versus 54.5. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Gemini 3.5 Flash has the edge for reasoning in this comparison, averaging 74.7 versus 52.9. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.
Gemini 3.5 Flash has the edge for agentic tasks in this comparison, averaging 77.2 versus 55.2. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Gemini 3.5 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 83.8 versus 80.3. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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