Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Aion-2.0 is clearly ahead on the aggregate, 58 to 49. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Aion-2.0's sharpest advantage is in instruction following, where it averages 93 against 79. The single biggest benchmark swing on the page is OpenBookQA, 75 to 45. Gemini 2.5 Flash does hit back in multimodal & grounded, so the answer changes if that is the part of the workload you care about most.
Aion-2.0 is also the more expensive model on tokens at $0.80 input / $1.60 output per 1M tokens, versus $0.15 input / $0.60 output per 1M tokens for Gemini 2.5 Flash. That is roughly 2.7x on output cost alone. Gemini 2.5 Flash gives you the larger context window at 1M, compared with 128K for Aion-2.0.
Pick Aion-2.0 if you want the stronger benchmark profile. Gemini 2.5 Flash only becomes the better choice if multimodal & grounded is the priority or you want the cheaper token bill.
Aion-2.0
51.7
Gemini 2.5 Flash
46.5
Aion-2.0
33.2
Gemini 2.5 Flash
21.7
Aion-2.0
66
Gemini 2.5 Flash
67.7
Aion-2.0
70.3
Gemini 2.5 Flash
59.2
Aion-2.0
54
Gemini 2.5 Flash
40.5
Aion-2.0
93
Gemini 2.5 Flash
79
Aion-2.0
78.1
Gemini 2.5 Flash
70.8
Aion-2.0
72.1
Gemini 2.5 Flash
59.4
Aion-2.0 is ahead overall, 58 to 49. The biggest single separator in this matchup is OpenBookQA, where the scores are 75 and 45.
Aion-2.0 has the edge for knowledge tasks in this comparison, averaging 54 versus 40.5. Inside this category, OpenBookQA is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for coding in this comparison, averaging 33.2 versus 21.7. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for math in this comparison, averaging 72.1 versus 59.4. Inside this category, AIME 2023 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 59.2. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for agentic tasks in this comparison, averaging 51.7 versus 46.5. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Gemini 2.5 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 67.7 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 79. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Aion-2.0 has the edge for multilingual tasks in this comparison, averaging 78.1 versus 70.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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