Gemini 1.5 Pro vs Gemini 2.5 Pro (I/O Edition)
Compare Gemini 1.5 Pro and Gemini 2.5 Pro (I/O Edition), both from Google AI, tested across 10 shared challenges.
Our Verdict
Gemini 2.5 Pro (I/O Edition)
Gemini 1.5 ProRunner-up
No community votes yet. On paper, Gemini 2.5 Pro (I/O Edition) has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Gemini 1.5 Pro
Input
$3.50
Output
$10.50
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
2.8× cheaper
Output
$10.00
1.1× cheaper
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 2.8× input, 1.1× output
Writing DNA
Style Comparison
Similarity
55%
Gemini 2.5 Pro (I/O Edition) uses 7.8x more headings
Gemini 1.5 Pro
Gemini 2.5 Pro (I/O Edition)
61%Vocabulary58%
15wSentence Length16w
0.80Hedging0.38
3.7Bold5.8
3.3Lists5.0
0.00Emoji0.00
0.08Headings0.63
0.09Transitions0.01
Based on 8 + 16 text responses
Research
What we learned reading every model
FAQ
