Compare / Gemini 3.1 Pro Preview vs Gemini 3 Flash Preview
Gemini 3.1 Pro Preview vs Gemini 3 Flash Preview
5 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Gemini 3.1 Pro Preview | Gemini 3 Flash Preview |
|---|---|---|---|
| UGI Leaderboardreported | Requested-length error% off the requested word count | 19.0% | 16.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.34 | 0.37 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 72.2 | 67.7 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 99.4% | 99.8% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 10.4% | 13.5% |
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.