Google: Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.5 Flash
Compare Google: Gemini 2.5 Flash Preview 09-2025 and Gemini 3.5 Flash, 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 3.5 Flash
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 3.6x 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
5.0× cheaper
Output
$2.50
3.6× cheaper
Gemini 3.5 Flash
Input
$1.50
Output
$9.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 5.0× input, 3.6× output
Writing DNA
Style Comparison
Similarity
57%
Google: Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
Gemini 3.5 Flash
53%Vocabulary59%
19wSentence Length18w
0.30Hedging0.16
5.8Bold4.4
3.1Lists3.0
0.14Emoji0.00
0.93Headings0.89
0.22Transitions0.11
Based on 22 + 27 text responses
Research
What we learned reading every model
FAQ
