OpenAI: GPT-5.6 Luna vs OpenAI: GPT-5.6 Terra
Compare OpenAI: GPT-5.6 Luna and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
OpenAI: GPT-5.6 LunaRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — bigger model tier.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Luna
Input
$1.00
2.5× cheaper
Output
$6.00
2.5× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
OpenAI: GPT-5.6 Luna is cheaper on both — 2.5× input, 2.5× output
Writing DNA
Style Comparison
Similarity
97%
OpenAI: GPT-5.6 Luna uses 1.8x more transitions
OpenAI: GPT-5.6 Luna
OpenAI: GPT-5.6 Terra
59%Vocabulary57%
19wSentence Length18w
0.84Hedging0.85
2.7Bold2.8
4.5Lists4.6
0.00Emoji0.00
1.20Headings1.12
0.10Transitions0.06
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
