Gemini 1.5 Pro vs GPT-5.6 Luna
Compare Gemini 1.5 Pro by Google AI against GPT-5.6 Luna by OpenAI, context windows of 1.0M vs 1.1M, tested across 18 shared challenges.
Our Verdict
Gemini 1.5 Pro
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 1.5 Pro
Input
$3.50
Output
$10.50
GPT-5.6 Luna
Input
$1.00
3.5× cheaper
Output
$6.00
1.8× cheaper
GPT-5.6 Luna is cheaper on both — 3.5× input, 1.8× output
Writing DNA
Style Comparison
Similarity
59%
GPT-5.6 Luna uses 14.8x more headings
Gemini 1.5 Pro
GPT-5.6 Luna
61%Vocabulary59%
15wSentence Length19w
0.80Hedging0.84
3.7Bold2.7
3.3Lists4.5
0.00Emoji0.00
0.08Headings1.20
0.09Transitions0.10
Based on 8 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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