Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5
89
o1-pro
30
Verified leaderboard positions: GPT-5.5 #2 · o1-pro unranked
Pick GPT-5.5 if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority.
Knowledge
+12.6 difference
GPT-5.5
o1-pro
$5 / $30
$150 / $600
N/A
N/A
N/A
N/A
1M
200K
Pick GPT-5.5 if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority.
GPT-5.5 is clearly ahead on the provisional aggregate, 89 to 30. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1-pro is also the more expensive model on tokens at $150.00 input / $600.00 output per 1M tokens, versus $5.00 input / $30.00 output per 1M tokens for GPT-5.5. That is roughly 20.0x on output cost alone. GPT-5.5 gives you the larger context window at 1M, compared with 200K for o1-pro.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 89 to 30. The biggest single separator in this matchup is GPQA, where the scores are 93.6% and 79%.
o1-pro has the edge for knowledge tasks in this comparison, averaging 79 versus 66.4. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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