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 30. 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 reasoning, where it averages 88.3 against 32.1. The single biggest benchmark swing on the page is HumanEval, 86 to 14.
Grok 4.1 Fast gives you the larger context window at 1M, compared with 32K for LFM2.5-1.2B-Instruct.
Pick Grok 4.1 Fast if you want the stronger benchmark profile. LFM2.5-1.2B-Instruct only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Grok 4.1 Fast
71
LFM2.5-1.2B-Instruct
25.7
Grok 4.1 Fast
59.5
LFM2.5-1.2B-Instruct
7.2
Grok 4.1 Fast
87.4
LFM2.5-1.2B-Instruct
32.4
Grok 4.1 Fast
88.3
LFM2.5-1.2B-Instruct
32.1
Grok 4.1 Fast
69.2
LFM2.5-1.2B-Instruct
26
Grok 4.1 Fast
90
LFM2.5-1.2B-Instruct
80
Grok 4.1 Fast
84.8
LFM2.5-1.2B-Instruct
60.7
Grok 4.1 Fast
92.3
LFM2.5-1.2B-Instruct
37
Grok 4.1 Fast is ahead overall, 76 to 30. The biggest single separator in this matchup is HumanEval, where the scores are 86 and 14.
Grok 4.1 Fast has the edge for knowledge tasks in this comparison, averaging 69.2 versus 26. 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 7.2. Inside this category, HumanEval 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 37. 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 32.1. 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 25.7. 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 32.4. 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 80. 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 60.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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