GPT-5 Pro vs Kimi K2.5
Compare GPT-5 Pro by OpenAI against Kimi K2.5 by Moonshot AI, context windows of 400K vs 262K, tested across 41 shared challenges.
Our Verdict
GPT-5 Pro
Kimi K2.5Runner-up
No community votes yet. On paper, GPT-5 Pro has the edge — bigger model tier, bigger context window, major provider backing.
Kimi K2.5 is 40x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
Kimi K2.5
Input
$0.60
25× cheaper
Output
$3.00
40× cheaper
Kimi K2.5 is cheaper on both — 25× input, 40× output
Writing DNA
Style Comparison
Similarity
44%
Kimi K2.5 uses 485.9x more bold
GPT-5 Pro
Kimi K2.5
65%Vocabulary61%
15wSentence Length21w
0.32Hedging0.55
0.0Bold4.9
2.9Lists2.8
0.00Emoji0.01
0.00Headings0.56
0.01Transitions0.17
Based on 11 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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