GPT-5.1-Codex-Mini vs MoonshotAI: Kimi K3
Compare GPT-5.1-Codex-Mini by OpenAI against MoonshotAI: Kimi K3 by Moonshot AI, context windows of 400K vs 1.0M, tested across 54 shared challenges.
Our Verdict
GPT-5.1-Codex-Mini
MoonshotAI: Kimi K3
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
GPT-5.1-Codex-Mini
Input
$1.50
2.0× cheaper
Output
$6.00
2.5× cheaper
MoonshotAI: Kimi K3
Input
$3.00
Output
$15.00
GPT-5.1-Codex-Mini is cheaper on both — 2.0× input, 2.5× output
Writing DNA
Style Comparison
Similarity
52%
MoonshotAI: Kimi K3 uses 77.9x more emoji
GPT-5.1-Codex-Mini
MoonshotAI: Kimi K3
65%Vocabulary58%
20wSentence Length21w
0.56Hedging0.46
3.3Bold3.6
3.4Lists3.4
0.00Emoji0.78
0.08Headings0.89
0.05Transitions0.17
Based on 13 + 27 text responses
Research
What we learned reading every model
FAQ
