Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
Compare Gemini 3.1 Pro Preview and Gemini 3.5 Flash, both from Google AI, in 5 community votes, gemini 3.5 flash wins 100% of head-to-head duels, context windows of 1.0M vs 1.0M, tested across 53 shared challenges.
Reasoning: Gemini 3.5 Flash wins 100% of votes
Image Generation: Gemini 3.5 Flash wins 100% of votes
Our Verdict
Gemini 3.5 FlashWinner
Gemini 3.1 Pro PreviewRunner-up
Pick Gemini 3.5 Flash. In 5 blind votes, Gemini 3.5 Flash wins 100% of the time. That's not luck.
Gemini 3.5 Flash particularly excels in Reasoning, Image Generation.
Clear winner
API pricing
Cost per 1M tokens
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
Gemini 3.5 Flash
Input
$1.50
1.3× cheaper
Output
$9.00
1.3× cheaper
Gemini 3.5 Flash is cheaper on both — 1.3× input, 1.3× output
Writing DNA
Style Comparison
Similarity
72%
Gemini 3.1 Pro Preview uses 1.8x more hedging
Gemini 3.1 Pro Preview
Gemini 3.5 Flash
54%Vocabulary59%
18wSentence Length18w
0.29Hedging0.16
4.9Bold4.4
3.3Lists3.0
0.00Emoji0.00
0.72Headings0.89
0.14Transitions0.11
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
