Gemini 2.5 Flash Preview (thinking) vs Gemini 3.5 Flash
Compare Gemini 2.5 Flash Preview (thinking) and Gemini 3.5 Flash, both from Google AI, context windows of 1.0M vs 1.0M, tested across 20 shared challenges.
Our Verdict
Gemini 3.5 Flash
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, Gemini 3.5 Flash has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
8.6× cheaper
Output
$3.50
2.6× cheaper
Gemini 3.5 Flash
Input
$1.50
Output
$9.00
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 8.6× input, 2.6× output
Writing DNA
Style Comparison
Similarity
54%
Gemini 3.5 Flash uses 89.0x more headings
Gemini 2.5 Flash Preview (thinking)
Gemini 3.5 Flash
53%Vocabulary59%
14wSentence Length18w
0.38Hedging0.16
4.4Bold4.4
4.1Lists3.0
0.00Emoji0.00
0.00Headings0.89
0.24Transitions0.11
Based on 7 + 27 text responses
Research
What we learned reading every model
FAQ
