GPT-5.1 vs GPT-5.6 Luna
Compare GPT-5.1 and GPT-5.6 Luna, both from OpenAI, in 16 community votes, gpt-5.6 luna wins 87% of head-to-head duels, context windows of 400K vs 1.1M, tested across 51 shared challenges.
Web Design: GPT-5.6 Luna wins 100% of votes
Reasoning: GPT-5.6 Luna wins 100% of votes
Image Generation: GPT-5.6 Luna wins 100% of votes
Conversation: GPT-5.1 and GPT-5.6 Luna are tied
Our Verdict
GPT-5.6 LunaWinner
GPT-5.1Runner-up
Pick GPT-5.6 Luna. In 16 blind votes, GPT-5.6 Luna wins 87% of the time. That's not luck.
GPT-5.6 Luna particularly excels in Web Design, Reasoning, Image Generation.
Clear winner
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
Output
$10.00
GPT-5.6 Luna
Input
$1.00
1.3× cheaper
Output
$6.00
1.7× cheaper
GPT-5.6 Luna is cheaper on both — 1.3× input, 1.7× output
Writing DNA
Style Comparison
Similarity
60%
GPT-5.6 Luna uses 3.6x more transitions
GPT-5.1
GPT-5.6 Luna
62%Vocabulary59%
19wSentence Length19w
0.29Hedging0.84
3.5Bold2.7
7.2Lists4.5
0.00Emoji0.00
0.61Headings1.20
0.03Transitions0.10
Based on 14 + 27 text responses
Research
What we learned reading every model
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