Compare / Gemini 3 Flash Preview vs GPT-5.5

Gemini 3 Flash Preview vs GPT-5.5

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 Flash Preview
Google · profile
GPT-5.5
OpenAI · profile
Results compared
5
Shared sources
2
BenchmarkMetricGemini 3 Flash PreviewGPT-5.5
UGI LeaderboardreportedRequested-length error% off the requested word count 16.0%13.0%
UGI LeaderboardreportedStyle adherencescore from 0 to 1 0.370.41
UGI LeaderboardreportedWriting scorescore out of 100 67.769.7
Vectara Hallucination LeaderboardreportedAnswer rate% of documents 99.8%100.0%
Vectara Hallucination LeaderboardreportedHallucination rate% of summaries 13.5%9.3%

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.