GPT-5 vs OpenAI: GPT-5.6 Luna
Compare GPT-5 and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 400K vs 1.1M, tested across 51 shared challenges.
Our Verdict
GPT-5
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-5
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
60%
OpenAI: GPT-5.6 Luna uses 14.6x more bold
GPT-5
OpenAI: GPT-5.6 Luna
65%Vocabulary59%
13wSentence Length19w
0.20Hedging0.84
0.2Bold2.7
4.6Lists4.5
0.00Emoji0.00
0.16Headings1.20
0.03Transitions0.10
Based on 16 + 27 text responses
Research
What we learned reading every model
FAQ
