Claude Opus 5 vs Kimi K2.5
Compare Claude Opus 5 by Anthropic against Kimi K2.5 by Moonshot AI, context windows of 1.0M vs 262K, tested across 54 shared challenges.
Our Verdict
Claude Opus 5
Kimi K2.5Runner-up
No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.
Kimi K2.5 is 8.3x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
Kimi K2.5
Input
$0.60
8.3× cheaper
Output
$3.00
8.3× cheaper
Kimi K2.5 is cheaper on both — 8.3× input, 8.3× output
Writing DNA
Style Comparison
Similarity
41%
Kimi K2.5 uses 3.3x more transitions
Claude Opus 5
Kimi K2.5
54%Vocabulary61%
21wSentence Length21w
0.40Hedging0.55
3.9Bold4.9
1.9Lists2.8
0.02Emoji0.01
0.71Headings0.56
0.05Transitions0.17
Based on 27 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
