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 56. 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 27.6. The single biggest benchmark swing on the page is SWE-bench Verified, 68 to 24.
Seed 1.6 Flash is the reasoning model in the pair, while Grok 4.1 Fast 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. Grok 4.1 Fast gives you the larger context window at 1M, compared with 256K for Seed 1.6 Flash.
Pick Grok 4.1 Fast if you want the stronger benchmark profile. Seed 1.6 Flash only becomes the better choice if you want the stronger reasoning-first profile.
Grok 4.1 Fast
71
Seed 1.6 Flash
54.5
Grok 4.1 Fast
59.5
Seed 1.6 Flash
27.6
Grok 4.1 Fast
87.4
Seed 1.6 Flash
73.1
Grok 4.1 Fast
88.3
Seed 1.6 Flash
66.8
Grok 4.1 Fast
69.2
Seed 1.6 Flash
47.3
Grok 4.1 Fast
90
Seed 1.6 Flash
81
Grok 4.1 Fast
84.8
Seed 1.6 Flash
72.8
Grok 4.1 Fast
92.3
Seed 1.6 Flash
67.1
Grok 4.1 Fast is ahead overall, 76 to 56. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 68 and 24.
Grok 4.1 Fast has the edge for knowledge tasks in this comparison, averaging 69.2 versus 47.3. Inside this category, MMLU 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 27.6. 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 67.1. 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 66.8. Inside this category, SimpleQA 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 54.5. 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 73.1. 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 81. 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 72.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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