GPT-5 Pro vs OpenAI: GPT-5.6 Luna
Compare GPT-5 Pro and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 400K vs 1.1M, tested across 41 shared challenges.
Our Verdict
GPT-5 Pro
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.
OpenAI: GPT-5.6 Luna is 20x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
OpenAI: GPT-5.6 Luna
Input
$1.00
15× cheaper
Output
$6.00
20× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 15× input, 20× output
Writing DNA
Style Comparison
Similarity
64%
OpenAI: GPT-5.6 Luna uses 275.0x more bold
GPT-5 Pro
OpenAI: GPT-5.6 Luna
65%Vocabulary59%
15wSentence Length19w
0.32Hedging0.84
0.0Bold2.7
2.9Lists4.5
0.00Emoji0.00
0.00Headings1.20
0.01Transitions0.10
Based on 11 + 27 text responses
Research
What we learned reading every model
FAQ
