GPT-4o (Omni) vs OpenAI: GPT-5.6 Luna
Compare GPT-4o (Omni) and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 128K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-4o (Omni)
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
GPT-4o (Omni)
Input
$2.50
Output
$10.00
OpenAI: GPT-5.6 Luna
Input
$1.00
2.5× cheaper
Output
$6.00
1.7× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 2.5× input, 1.7× output
Writing DNA
Style Comparison
Similarity
66%
GPT-4o (Omni) uses 2.5x more emoji
GPT-4o (Omni)
OpenAI: GPT-5.6 Luna
54%Vocabulary59%
18wSentence Length19w
0.72Hedging0.84
7.3Bold2.7
5.6Lists4.5
0.03Emoji0.00
1.40Headings1.20
0.26Transitions0.10
Based on 24 + 27 text responses
Research
What we learned reading every model
FAQ
