Claude Opus 5 vs Kimi K2 Thinking
Compare Claude Opus 5 by Anthropic against Kimi K2 Thinking by Moonshot AI, context windows of 1.0M vs 262K, tested across 54 shared challenges.
Our Verdict
Claude Opus 5
Kimi K2 ThinkingRunner-up
No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window, major provider backing.
Kimi K2 Thinking is 10x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
Kimi K2 Thinking
Input
$0.60
8.3× cheaper
Output
$2.50
10× cheaper
Kimi K2 Thinking is cheaper on both — 8.3× input, 10× output
Writing DNA
Style Comparison
Similarity
32%
Claude Opus 5 uses 1.7x more emoji
Claude Opus 5
Kimi K2 Thinking
54%Vocabulary57%
21wSentence Length26w
0.40Hedging0.36
3.9Bold5.8
1.9Lists6.0
0.02Emoji0.00
0.71Headings0.56
0.05Transitions0.06
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
