Claude Sonnet 4.5 vs Kimi K2
Compare Claude Sonnet 4.5 by Anthropic against Kimi K2 by Moonshot AI, tested across 43 shared challenges.
Our Verdict
Claude Sonnet 4.5
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 6.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Kimi K2
Input
$0.57
5.3× cheaper
Output
$2.30
6.5× cheaper
Kimi K2 is cheaper on both — 5.3× input, 6.5× output
Writing DNA
Style Comparison
Similarity
48%
Claude Sonnet 4.5 uses 5.0x more sentence length
Claude Sonnet 4.5
Kimi K2
64%Vocabulary63%
94wSentence Length19w
0.48Hedging0.35
4.9Bold4.2
8.0Lists3.6
0.45Emoji0.68
1.91Headings0.61
0.07Transitions0.06
Based on 20 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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