Gemini 2.5 Pro (I/O Edition) vs GPT-5.5
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against GPT-5.5 by OpenAI, tested across 40 shared challenges.
Our Verdict
Gemini 2.5 Pro (I/O Edition)
GPT-5.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Pro (I/O Edition) is 3.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
4.0× cheaper
Output
$10.00
3.0× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 4.0× input, 3.0× output
Writing DNA
Style Comparison
Similarity
42%
GPT-5.5 uses 2.9x more transitions
Gemini 2.5 Pro (I/O Edition)
GPT-5.5
58%Vocabulary58%
16wSentence Length18w
0.38Hedging0.74
5.8Bold2.9
5.0Lists5.1
0.00Emoji0.00
0.63Headings1.68
0.01Transitions0.03
Based on 16 + 26 text responses
Research
What we learned reading every model
FAQ
