OpenAI: GPT-5.6 Luna vs OpenAI o3
Compare OpenAI: GPT-5.6 Luna and OpenAI o3, both from OpenAI, tested across 53 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna
OpenAI o3
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 6.7x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Luna
Input
$1.00
10× cheaper
Output
$6.00
6.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
OpenAI: GPT-5.6 Luna is cheaper on both — 10× input, 6.7× output
Writing DNA
Style Comparison
Similarity
55%
OpenAI: GPT-5.6 Luna uses 4.0x more bold
OpenAI: GPT-5.6 Luna
OpenAI o3
59%Vocabulary68%
19wSentence Length14w
0.84Hedging0.26
2.7Bold0.7
4.5Lists3.0
0.00Emoji0.00
1.20Headings0.38
0.10Transitions0.12
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
