Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Grok 4.1 Fast is clearly ahead on the aggregate, 76 to 58. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Grok 4.1 Fast's sharpest advantage is in coding, where it averages 59.5 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.
Grok 4.1 Fast gives you the larger context window at 1M, compared with 128K for Aion-2.0.
Pick Grok 4.1 Fast if you want the stronger benchmark profile. Aion-2.0 only becomes the better choice if instruction following is the priority.
Grok 4.1 Fast
71
Aion-2.0
51.7
Grok 4.1 Fast
59.5
Aion-2.0
33.2
Grok 4.1 Fast
87.4
Aion-2.0
66
Grok 4.1 Fast
88.3
Aion-2.0
70.3
Grok 4.1 Fast
69.2
Aion-2.0
54
Grok 4.1 Fast
90
Aion-2.0
93
Grok 4.1 Fast
84.8
Aion-2.0
78.1
Grok 4.1 Fast
92.3
Aion-2.0
72.1
Grok 4.1 Fast is ahead overall, 76 to 58. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 68 and 35.
Grok 4.1 Fast has the edge for knowledge tasks in this comparison, averaging 69.2 versus 54. Inside this category, FrontierScience is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for coding in this comparison, averaging 59.5 versus 33.2. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for math in this comparison, averaging 92.3 versus 72.1. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for reasoning in this comparison, averaging 88.3 versus 70.3. Inside this category, MRCRv2 is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for agentic tasks in this comparison, averaging 71 versus 51.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for multimodal and grounded tasks in this comparison, averaging 87.4 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 90. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for multilingual tasks in this comparison, averaging 84.8 versus 78.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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