Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5 Pro
100
LongCat-2.0
80
Pick GPT-5.5 Pro if you want the stronger benchmark profile. LongCat-2.0 only becomes the better choice if you want the cheaper token bill.
Agentic
+19.3 difference
GPT-5.5 Pro
LongCat-2.0
$30 / $180
$0.75 / $2.95
N/A
N/A
N/A
N/A
1M
1M
Pick GPT-5.5 Pro if you want the stronger benchmark profile. LongCat-2.0 only becomes the better choice if you want the cheaper token bill.
GPT-5.5 Pro is clearly ahead on the provisional aggregate, 100 to 80. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5 Pro's sharpest advantage is in agentic, where it averages 90.1 against 70.8.
GPT-5.5 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.75 input / $2.95 output per 1M tokens for LongCat-2.0. That is roughly 61.0x on output cost alone.
GPT-5.5 Pro is ahead on BenchLM's provisional leaderboard, 100 to 80.
GPT-5.5 Pro has the edge for agentic tasks in this comparison, averaging 90.1 versus 70.8. LongCat-2.0 stays close enough that the answer can still flip depending on your workload.
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