Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude Haiku 4.5 is clearly ahead on the aggregate, 62 to 58. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Haiku 4.5's sharpest advantage is in multimodal & grounded, where it averages 78.4 against 66. The single biggest benchmark swing on the page is MMMU-Pro, 82 to 61. 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 Haiku 4.5 is also the more expensive model on tokens at $0.80 input / $4.00 output per 1M tokens, versus $0.80 input / $1.60 output per 1M tokens for Aion-2.0. That is roughly 2.5x on output cost alone. Claude Haiku 4.5 gives you the larger context window at 200K, compared with 128K for Aion-2.0.
Pick Claude Haiku 4.5 if you want the stronger benchmark profile. Aion-2.0 only becomes the better choice if instruction following is the priority or you want the cheaper token bill.
Claude Haiku 4.5
56.7
Aion-2.0
51.7
Claude Haiku 4.5
41.7
Aion-2.0
33.2
Claude Haiku 4.5
78.4
Aion-2.0
66
Claude Haiku 4.5
68.9
Aion-2.0
70.3
Claude Haiku 4.5
53.6
Aion-2.0
54
Claude Haiku 4.5
86
Aion-2.0
93
Claude Haiku 4.5
80.1
Aion-2.0
78.1
Claude Haiku 4.5
73.3
Aion-2.0
72.1
Claude Haiku 4.5 is ahead overall, 62 to 58. The biggest single separator in this matchup is MMMU-Pro, where the scores are 82 and 61.
Aion-2.0 has the edge for knowledge tasks in this comparison, averaging 54 versus 53.6. Inside this category, OpenBookQA is the benchmark that creates the most daylight between them.
Claude Haiku 4.5 has the edge for coding in this comparison, averaging 41.7 versus 33.2. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Claude Haiku 4.5 has the edge for math in this comparison, averaging 73.3 versus 72.1. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for reasoning in this comparison, averaging 70.3 versus 68.9. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude Haiku 4.5 has the edge for agentic tasks in this comparison, averaging 56.7 versus 51.7. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Claude Haiku 4.5 has the edge for multimodal and grounded tasks in this comparison, averaging 78.4 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 86. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Claude Haiku 4.5 has the edge for multilingual tasks in this comparison, averaging 80.1 versus 78.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
Get notified when new models drop, benchmark scores change, or the leaderboard shifts. One email per week.
Free. No spam. Unsubscribe anytime. We only store derived location metadata for consent routing.