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 66. 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 multimodal & grounded, where it averages 87.4 against 66.7. The single biggest benchmark swing on the page is MMMU-Pro, 91 to 64.
Grok 4.1 Fast gives you the larger context window at 1M, compared with 256K for Step 3.5 Flash.
Pick Grok 4.1 Fast if you want the stronger benchmark profile. Step 3.5 Flash only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Grok 4.1 Fast
71
Step 3.5 Flash
60.2
Grok 4.1 Fast
59.5
Step 3.5 Flash
47.1
Grok 4.1 Fast
87.4
Step 3.5 Flash
66.7
Grok 4.1 Fast
88.3
Step 3.5 Flash
78.3
Grok 4.1 Fast
69.2
Step 3.5 Flash
60.8
Grok 4.1 Fast
90
Step 3.5 Flash
87
Grok 4.1 Fast
84.8
Step 3.5 Flash
82.8
Grok 4.1 Fast
92.3
Step 3.5 Flash
84.5
Grok 4.1 Fast is ahead overall, 76 to 66. The biggest single separator in this matchup is MMMU-Pro, where the scores are 91 and 64.
Grok 4.1 Fast has the edge for knowledge tasks in this comparison, averaging 69.2 versus 60.8. 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 47.1. 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 84.5. 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 78.3. 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 60.2. 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 66.7. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for instruction following in this comparison, averaging 90 versus 87. 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 82.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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