Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5
91
MiMo-V2.5-Pro
86
Verified leaderboard positions: GPT-5.5 #5 · MiMo-V2.5-Pro unranked
Pick GPT-5.5 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
+13.1 difference
Coding
+1.4 difference
Knowledge
+18.4 difference
GPT-5.5
MiMo-V2.5-Pro
$5 / $30
$null / $null
N/A
N/A
N/A
N/A
1M
1M
Pick GPT-5.5 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 is clearly ahead on the provisional aggregate, 91 to 86. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5's sharpest advantage is in knowledge, where it averages 66.4 against 48. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 82% to 68.4%.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 91 to 86. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 82% and 68.4%.
GPT-5.5 has the edge for knowledge tasks in this comparison, averaging 66.4 versus 48. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.
GPT-5.5 has the edge for coding in this comparison, averaging 58.6 versus 57.2. Inside this category, Terminal-Bench Hard is the benchmark that creates the most daylight between them.
GPT-5.5 has the edge for agentic tasks in this comparison, averaging 81.5 versus 68.4. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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