GPT-5.6 Luna Pro vs GPT-5.6 Terra
Compare GPT-5.6 Luna Pro and GPT-5.6 Terra, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 54 shared challenges.
Our Verdict
GPT-5.6 Terra
GPT-5.6 Luna ProRunner-up
No community votes yet. On paper, GPT-5.6 Terra has the edge — bigger model tier.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.6 Luna Pro
Input
$1.00
2.5× cheaper
Output
$6.00
2.5× cheaper
GPT-5.6 Terra
Input
$2.50
Output
$15.00
GPT-5.6 Luna Pro is cheaper on both — 2.5× input, 2.5× output
Writing DNA
Style Comparison
Similarity
85%
GPT-5.6 Luna Pro uses 53.7x more emoji
GPT-5.6 Luna Pro
GPT-5.6 Terra
58%Vocabulary57%
18wSentence Length18w
0.81Hedging0.85
2.9Bold2.8
5.1Lists4.6
0.54Emoji0.00
1.10Headings1.12
0.09Transitions0.06
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
