GPT-5.4 Pro vs Kimi K2
Compare GPT-5.4 Pro by OpenAI against Kimi K2 by Moonshot AI, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
Kimi K2Runner-up
No community votes yet. On paper, GPT-5.4 Pro has the edge — newer, bigger context window, major provider backing.
Kimi K2 is 78x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Kimi K2
Input
$0.57
53× cheaper
Output
$2.30
78× cheaper
Kimi K2 is cheaper on both — 53× input, 78× output
Writing DNA
Style Comparison
Similarity
44%
Kimi K2 uses 68.5x more emoji
GPT-5.4 Pro
Kimi K2
50%Vocabulary63%
35wSentence Length19w
0.70Hedging0.35
7.5Bold4.2
8.3Lists3.6
0.00Emoji0.68
2.52Headings0.61
0.01Transitions0.06
Based on 12 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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