Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.4 nano
60
o3-mini
56
Pick GPT-5.4 nano if you want the stronger benchmark profile. o3-mini only becomes the better choice if knowledge is the priority.
Knowledge
+24.0 difference
GPT-5.4 nano
o3-mini
$0.2 / $1.25
$1.1 / $4.4
191 t/s
160 t/s
3.64s
7.12s
400K
200K
Pick GPT-5.4 nano if you want the stronger benchmark profile. o3-mini only becomes the better choice if knowledge is the priority.
GPT-5.4 nano is clearly ahead on the provisional aggregate, 60 to 56. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o3-mini is also the more expensive model on tokens at $1.10 input / $4.40 output per 1M tokens, versus $0.20 input / $1.25 output per 1M tokens for GPT-5.4 nano. That is roughly 3.5x on output cost alone. GPT-5.4 nano gives you the larger context window at 400K, compared with 200K for o3-mini.
GPT-5.4 nano is ahead on BenchLM's provisional leaderboard, 60 to 56. The biggest single separator in this matchup is GPQA, where the scores are 82.8% and 77.2%.
o3-mini has the edge for knowledge tasks in this comparison, averaging 77.2 versus 53.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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