GPT-5 vs Kimi K2.5
Compare GPT-5 by OpenAI against Kimi K2.5 by Moonshot AI, context windows of 400K vs 262K, tested across 51 shared challenges.
Our Verdict
GPT-5
Kimi K2.5Runner-up
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, bigger context window, major provider backing.
Kimi K2.5 is 3.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
Output
$10.00
Kimi K2.5
Input
$0.60
2.1× cheaper
Output
$3.00
3.3× cheaper
Kimi K2.5 is cheaper on both — 2.1× input, 3.3× output
Writing DNA
Style Comparison
Similarity
52%
GPT-5
Kimi K2.5
65%Vocabulary61%
13wSentence Length21w
0.20Hedging0.55
0.2Bold4.9
4.6Lists2.8
0.00Emoji0.01
0.16Headings0.56
0.03Transitions0.17
Based on 16 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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