Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Grok 4.1 Fast is clearly ahead on the aggregate, 83 to 39. 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 multilingual, where it averages 88 against 80.6. The single biggest benchmark swing on the page is GPQA, 92 to 56.1. Phi-4 does hit back in coding, 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 16K for Phi-4.
Pick Grok 4.1 Fast if you want the stronger benchmark profile. Phi-4 only becomes the better choice if coding is the priority.
Grok 4.1 Fast
77.5
Phi-4
70.5
Grok 4.1 Fast
69.3
Phi-4
82.6
Grok 4.1 Fast
88
Phi-4
80.6
Grok 4.1 Fast is ahead overall, 83 to 39. The biggest single separator in this matchup is GPQA, where the scores are 92 and 56.1.
Grok 4.1 Fast has the edge for knowledge tasks in this comparison, averaging 77.5 versus 70.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Phi-4 has the edge for coding in this comparison, averaging 82.6 versus 69.3. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
Grok 4.1 Fast has the edge for multilingual tasks in this comparison, averaging 88 versus 80.6. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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