Claude Opus 4.1 vs Kimi K2
Compare Claude Opus 4.1 by Anthropic against Kimi K2 by Moonshot AI, tested across 53 shared challenges. Updated May 2026.
Which is better, Claude Opus 4.1 or Kimi K2?
Claude Opus 4.1 and Kimi K2 are both competitive models. Claude Opus 4.1 costs $15/M input tokens vs $0.57/M for Kimi K2. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.1 and Kimi K2
Claude Opus 4.1 is made by anthropic while Kimi K2 is from moonshotai. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $0.57/M for Kimi K2.
API pricing
Per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
Kimi K2
Input
$0.57
26× cheaper
Output
$2.30
33× cheaper
Kimi K2 is cheaper on both — 26× input, 33× output
Our Verdict
Claude Opus 4.1
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 33x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
48%
Claude Opus 4.1 uses 4.7x more sentence length
Claude Opus 4.1
Kimi K2
61%Vocabulary63%
87wSentence Length19w
0.54Hedging0.35
5.1Bold4.2
6.7Lists3.6
0.38Emoji0.68
1.68Headings0.61
0.13Transitions0.06
Based on 17 + 22 text responses
FAQ
