Compare / Gemini 3.1 Pro Preview vs grok-4-fast-non-reasoning

Gemini 3.1 Pro Preview vs grok-4-fast-non-reasoning

5 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.

Gemini 3.1 Pro Preview
Google · profile
grok-4-fast-non-reasoning
xAI · profile
Results compared
5
Shared sources
2
BenchmarkMetricGemini 3.1 Pro Previewgrok-4-fast-non-reasoning
UGI LeaderboardreportedRequested-length error% off the requested word count 19.0%19.0%
UGI LeaderboardreportedStyle adherencescore from 0 to 1 0.340.33
UGI LeaderboardreportedWriting scorescore out of 100 72.243.0
Vectara Hallucination LeaderboardreportedAnswer rate% of documents 99.4%99.2%
Vectara Hallucination LeaderboardreportedHallucination rate% of summaries 10.4%19.7%

Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.