Google: Gemini 2.5 Flash Preview 09-2025 vs OpenAI: GPT-5.6 Luna Pro
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against OpenAI: GPT-5.6 Luna Pro by OpenAI, context windows of 1.0M vs 1.1M, tested across 50 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
OpenAI: GPT-5.6 Luna Pro
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
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
3.3× cheaper
Output
$2.50
2.4× cheaper
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 3.3× input, 2.4× output
Writing DNA
Style Comparison
Similarity
41%
OpenAI: GPT-5.6 Luna Pro uses 4.0x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
OpenAI: GPT-5.6 Luna Pro
53%Vocabulary58%
19wSentence Length18w
0.30Hedging0.81
5.8Bold2.9
3.1Lists5.1
0.14Emoji0.54
0.93Headings1.10
0.22Transitions0.09
Based on 22 + 27 text responses
Research
What we learned reading every model
FAQ
