Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5 Pro
100
MiMo-V2.5-Pro
81
Pick GPT-5.5 Pro if you want the stronger benchmark profile. MiMo-V2.5-Pro only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Agentic
+21.7 difference
Knowledge
+9.2 difference
GPT-5.5 Pro
MiMo-V2.5-Pro
$30 / $180
$null / $null
N/A
N/A
N/A
N/A
1M
1M
Pick GPT-5.5 Pro if you want the stronger benchmark profile. MiMo-V2.5-Pro only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
GPT-5.5 Pro is clearly ahead on the provisional aggregate, 100 to 81. 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 68.4. The single biggest benchmark swing on the page is HLE, 57.2% to 48%.
GPT-5.5 Pro is ahead on BenchLM's provisional leaderboard, 100 to 81. The biggest single separator in this matchup is HLE, where the scores are 57.2% and 48%.
GPT-5.5 Pro has the edge for knowledge tasks in this comparison, averaging 57.2 versus 48. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.5 Pro has the edge for agentic tasks in this comparison, averaging 90.1 versus 68.4. MiMo-V2.5-Pro stays close enough that the answer can still flip depending on your workload.
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