Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Gemini 3.5 Flash
88
GPT-5.4 mini
70
Verified leaderboard positions: Gemini 3.5 Flash #7 · GPT-5.4 mini unranked
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if you want the cheaper token bill.
Agentic
+11.6 difference
Knowledge
+0.6 difference
Multimodal
+7.2 difference
Gemini 3.5 Flash
GPT-5.4 mini
$1.5 / $9
$0.75 / $4.5
284.2 t/s
201 t/s
18.55s
3.85s
1M
400K
Pick Gemini 3.5 Flash if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if you want the cheaper token bill.
Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 88 to 70. 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 65.6. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 76.2% to 60%.
Gemini 3.5 Flash is also the more expensive model on tokens at $1.50 input / $9.00 output per 1M tokens, versus $0.75 input / $4.50 output per 1M tokens for GPT-5.4 mini. That is roughly 2.0x on output cost alone. Gemini 3.5 Flash gives you the larger context window at 1M, compared with 400K for GPT-5.4 mini.
Gemini 3.5 Flash is ahead on BenchLM's provisional leaderboard, 88 to 70. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 76.2% and 60%.
Gemini 3.5 Flash has the edge for knowledge tasks in this comparison, averaging 58 versus 57.4. Inside this category, GPQA 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 65.6. Inside this category, MCP Atlas 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 76.6. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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