Gemini 2.5 Pro (I/O Edition) vs OpenAI: GPT-5.6 Luna
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against OpenAI: GPT-5.6 Luna by OpenAI, tested across 40 shared challenges.
Our Verdict
Gemini 2.5 Pro (I/O Edition)
OpenAI: GPT-5.6 Luna
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
OpenAI: GPT-5.6 Luna
Input
$1.00
1.3× cheaper
Output
$6.00
1.7× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 1.3× input, 1.7× output
Writing DNA
Style Comparison
Similarity
51%
OpenAI: GPT-5.6 Luna uses 8.3x more transitions
Gemini 2.5 Pro (I/O Edition)
OpenAI: GPT-5.6 Luna
58%Vocabulary59%
16wSentence Length19w
0.38Hedging0.84
5.8Bold2.7
5.0Lists4.5
0.00Emoji0.00
0.63Headings1.20
0.01Transitions0.10
Based on 16 + 27 text responses
Research
What we learned reading every model
FAQ
