OpenAI: GPT-5.6 Luna vs Kimi K2.5
Compare OpenAI: GPT-5.6 Luna by OpenAI against Kimi K2.5 by Moonshot AI, context windows of 1.1M vs 262K, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna
Kimi K2.5
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 K2.5
Input
$0.60
1.7× cheaper
Output
$3.00
2.0× cheaper
Kimi K2.5 is cheaper on both — 1.7× input, 2.0× output
Writing DNA
Style Comparison
Similarity
44%
OpenAI: GPT-5.6 Luna
Kimi K2.5
59%Vocabulary61%
19wSentence Length21w
0.84Hedging0.55
2.7Bold4.9
4.5Lists2.8
0.00Emoji0.01
1.20Headings0.56
0.10Transitions0.17
Based on 27 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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