Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Claude Opus 4.5 is clearly ahead on the aggregate, 85 to 51. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in coding, where it averages 72 against 41. The single biggest benchmark swing on the page is SWE-bench Verified, 68 to 41. o1 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o1 is the reasoning model in the pair, while Claude Opus 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.
Pick Claude Opus 4.5 if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you want the stronger reasoning-first profile.
Claude Opus 4.5
80.8
o1
83.8
Claude Opus 4.5
72
o1
41
Claude Opus 4.5
96.1
o1
74.3
Claude Opus 4.5
90
o1
92.2
Claude Opus 4.5 is ahead overall, 85 to 51. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 68 and 41.
o1 has the edge for knowledge tasks in this comparison, averaging 83.8 versus 80.8. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for coding in this comparison, averaging 72 versus 41. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for math in this comparison, averaging 96.1 versus 74.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o1 has the edge for instruction following in this comparison, averaging 92.2 versus 90. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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