Compare / Claude Opus 5.5 vs Gemini 3 Flash Preview

Claude Opus 5.5 vs Gemini 3 Flash Preview

5 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.

Claude Opus 5.5
Anthropic · profile
Gemini 3 Flash Preview
Google · profile
Results compared
5
Shared sources
3
BenchmarkMetricClaude Opus 5.5Gemini 3 Flash Preview
GDP.pdfreportedProfessional document tasks% of rubric 30.6%10.0%
SimpleQA Verified (Epoch AI)reportedCorrect answers% of questions 72.2%66.8%
UGI LeaderboardreportedRequested-length error% off the requested word count 2.0%16.0%
UGI LeaderboardreportedStyle adherencescore from 0 to 1 0.430.37
UGI LeaderboardreportedWriting scorescore out of 100 70.067.7

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.