OpenAI: GPT-5.6 Luna vs Kimi K2 Thinking
Compare OpenAI: GPT-5.6 Luna by OpenAI against Kimi K2 Thinking by Moonshot AI, context windows of 1.1M vs 262K, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna
Kimi K2 Thinking
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Luna
Input
$1.00
Output
$6.00
Kimi K2 Thinking
Input
$0.60
1.7× cheaper
Output
$2.50
2.4× cheaper
Kimi K2 Thinking is cheaper on both — 1.7× input, 2.4× output
Writing DNA
Style Comparison
Similarity
41%
OpenAI: GPT-5.6 Luna uses 2.4x more hedging
OpenAI: GPT-5.6 Luna
Kimi K2 Thinking
59%Vocabulary57%
19wSentence Length26w
0.84Hedging0.36
2.7Bold5.8
4.5Lists6.0
0.00Emoji0.00
1.20Headings0.56
0.10Transitions0.06
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
