GPT-5.1 Chat vs Kimi K2
Compare GPT-5.1 Chat by OpenAI against Kimi K2 by Moonshot AI, tested across 53 shared challenges.
Our Verdict
GPT-5.1 Chat
Kimi K2
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Kimi K2 is 4.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1 Chat
Input
$1.25
Output
$10.00
Kimi K2
Input
$0.57
2.2× cheaper
Output
$2.30
4.3× cheaper
Kimi K2 is cheaper on both — 2.2× input, 4.3× output
Writing DNA
Style Comparison
Similarity
70%
Kimi K2 uses 68.5x more emoji
GPT-5.1 Chat
Kimi K2
73%Vocabulary63%
18wSentence Length19w
0.45Hedging0.35
1.1Bold4.2
2.4Lists3.6
0.00Emoji0.68
0.00Headings0.61
0.06Transitions0.06
Based on 15 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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