Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5
89
MiMo-V2.5-Pro
81
Verified leaderboard positions: GPT-5.5 #2 · 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
+13.4 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, 89 to 81. 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, 82.7% to 68.4%.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 89 to 81. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 82.7% and 68.4%.
GPT-5.5 has the edge for knowledge tasks in this comparison, averaging 66.4 versus 48. Inside this category, HLE w/o tools 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, terminalBench2 is the benchmark that creates the most daylight between them.
GPT-5.5 has the edge for agentic tasks in this comparison, averaging 81.8 versus 68.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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