Gemini 1.5 Pro vs Gemini 3 Flash Preview
Compare Gemini 1.5 Pro and Gemini 3 Flash Preview, both from Google AI, context windows of 1.0M vs 1.0M, tested across 19 shared challenges.
Our Verdict
Gemini 1.5 Pro
Gemini 3 Flash Preview
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 3 Flash Preview is 3.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 1.5 Pro
Input
$3.50
Output
$10.50
Gemini 3 Flash Preview
Input
$0.50
7.0× cheaper
Output
$3.00
3.5× cheaper
Gemini 3 Flash Preview is cheaper on both — 7.0× input, 3.5× output
Writing DNA
Style Comparison
Similarity
60%
Gemini 3 Flash Preview uses 10.4x more headings
Gemini 1.5 Pro
Gemini 3 Flash Preview
61%Vocabulary55%
15wSentence Length18w
0.80Hedging0.42
3.7Bold7.1
3.3Lists4.5
0.00Emoji0.00
0.08Headings0.84
0.09Transitions0.07
Based on 8 + 24 text responses
Research
What we learned reading every model
FAQ
