Google: Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.1 Pro Preview
Compare Google: Gemini 2.5 Flash Preview 09-2025 and Gemini 3.1 Pro Preview, both from Google AI, context windows of 1.0M vs 1.0M, tested across 50 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
Gemini 3.1 Pro Preview
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Google: Gemini 2.5 Flash Preview 09-2025 is 4.8x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
6.7× cheaper
Output
$2.50
4.8× cheaper
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 6.7× input, 4.8× output
Writing DNA
Style Comparison
Similarity
60%
Google: Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
Gemini 3.1 Pro Preview
53%Vocabulary54%
19wSentence Length18w
0.30Hedging0.29
5.8Bold4.9
3.1Lists3.3
0.14Emoji0.00
0.93Headings0.72
0.22Transitions0.14
Based on 22 + 23 text responses
Research
What we learned reading every model
FAQ
