Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude Opus 4.5 is clearly ahead on the aggregate, 77 to 58. 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 60.4 against 33.2. The single biggest benchmark swing on the page is SWE-bench Verified, 68 to 35. Aion-2.0 does hit back in instruction following, so the answer changes if that is the part of the workload you care about most.
Claude Opus 4.5 gives you the larger context window at 200K, compared with 128K for Aion-2.0.
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Aion-2.0 only becomes the better choice if instruction following is the priority.
Claude Opus 4.5
70.5
Aion-2.0
51.7
Claude Opus 4.5
60.4
Aion-2.0
33.2
Claude Opus 4.5
90.9
Aion-2.0
66
Claude Opus 4.5
87.7
Aion-2.0
70.3
Claude Opus 4.5
70.9
Aion-2.0
54
Claude Opus 4.5
90
Aion-2.0
93
Claude Opus 4.5
86.1
Aion-2.0
78.1
Claude Opus 4.5
93.2
Aion-2.0
72.1
Claude Opus 4.5 is ahead overall, 77 to 58. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 68 and 35.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 70.9 versus 54. Inside this category, MMLU is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for coding in this comparison, averaging 60.4 versus 33.2. 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 93.2 versus 72.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 87.7 versus 70.3. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 70.5 versus 51.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for multimodal and grounded tasks in this comparison, averaging 90.9 versus 66. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for instruction following in this comparison, averaging 93 versus 90. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for multilingual tasks in this comparison, averaging 86.1 versus 78.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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