Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Aion-2.0 has the cleaner overall profile here, landing at 58 versus 56. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Aion-2.0's sharpest advantage is in instruction following, where it averages 93 against 81. The single biggest benchmark swing on the page is SimpleQA, 76 to 61. Seed 1.6 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 $0.08 input / $0.30 output per 1M tokens for Seed 1.6 Flash. That is roughly 5.3x on output cost alone. Seed 1.6 Flash is the reasoning model in the pair, while Aion-2.0 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. Seed 1.6 Flash gives you the larger context window at 256K, compared with 128K for Aion-2.0.
Pick Aion-2.0 if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if multimodal & grounded is the priority or you want the cheaper token bill.
Aion-2.0
51.7
Seed 1.6 Flash
54.5
Aion-2.0
33.2
Seed 1.6 Flash
27.6
Aion-2.0
66
Seed 1.6 Flash
73.1
Aion-2.0
70.3
Seed 1.6 Flash
66.8
Aion-2.0
54
Seed 1.6 Flash
47.3
Aion-2.0
93
Seed 1.6 Flash
81
Aion-2.0
78.1
Seed 1.6 Flash
72.8
Aion-2.0
72.1
Seed 1.6 Flash
67.1
Aion-2.0 is ahead overall, 58 to 56. The biggest single separator in this matchup is SimpleQA, where the scores are 76 and 61.
Aion-2.0 has the edge for knowledge tasks in this comparison, averaging 54 versus 47.3. 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 27.6. Inside this category, SWE-bench Verified 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 67.1. 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 66.8. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for agentic tasks in this comparison, averaging 54.5 versus 51.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Seed 1.6 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 73.1 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 81. 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 72.8. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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