Gemini 2.5 Pro (I/O Edition) vs GPT-5.1-Codex
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against GPT-5.1-Codex by OpenAI, tested across 41 shared challenges.
Our Verdict
Gemini 2.5 Pro (I/O Edition)
GPT-5.1-Codex
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Writing DNA
Style Comparison
Similarity
42%
GPT-5.1-Codex uses 32.3x more transitions
Gemini 2.5 Pro (I/O Edition)
GPT-5.1-Codex
58%Vocabulary70%
16wSentence Length17w
0.38Hedging0.39
5.8Bold3.4
5.0Lists3.5
0.00Emoji0.00
0.63Headings0.50
0.01Transitions0.38
Based on 16 + 14 text responses
Research
What we learned reading every model
FAQ
