OpenAI: GPT-5.6 Luna Pro vs MoonshotAI: Kimi K2 0905
Compare OpenAI: GPT-5.6 Luna Pro by OpenAI against MoonshotAI: Kimi K2 0905 by Moonshot AI, context windows of 1.1M vs 262K, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna Pro
MoonshotAI: Kimi K2 0905
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 Pro
Input
$1.00
Output
$6.00
MoonshotAI: Kimi K2 0905
Input
$0.60
1.7× cheaper
Output
$2.50
2.4× cheaper
MoonshotAI: Kimi K2 0905 is cheaper on both — 1.7× input, 2.4× output
Writing DNA
Style Comparison
Similarity
40%
OpenAI: GPT-5.6 Luna Pro uses 4.7x more hedging
OpenAI: GPT-5.6 Luna Pro
MoonshotAI: Kimi K2 0905
58%Vocabulary62%
18wSentence Length19w
0.81Hedging0.17
2.9Bold3.3
5.1Lists3.4
0.54Emoji0.15
1.10Headings0.83
0.09Transitions0.06
Based on 27 + 22 text responses
Research
What we learned reading every model
FAQ
