Claude Opus 4.1vsKimi K2
Kimi K2 is cheaper than Claude Opus 4.1 at $0.57/M vs $15/M input tokens.
| Spec | Claude Opus 4.1 | Kimi K2 |
|---|---|---|
| Input price | $15/M tokens | $0.57/M tokens |
| Output price | $75/M tokens | $2.3/M tokens |
| Context window | 200K tokens | — |
| Released | Aug 2025 | Jul 2025 |
| SWE-bench Verified | 74.5% | 65.8% |
Our Verdict
Claude Opus 4.1
Kimi K2
Not enough votes to call it. On the specs, nothing separates them.
Kimi K2 costs 33x less per token.
Too close to call
API pricing
Cost 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
Writing DNA
Style Comparison
Similarity
48%
Claude Opus 4.1 uses 3.4x more sentence length
Claude Opus 4.1
Kimi K2
63%Vocabulary66%
64wSentence Length19w
0.72Hedging0.34
4.5Bold3.3
5.3Lists3.4
0.81Emoji0.54
1.42Headings0.48
0.16Transitions0.05
Based on 26 + 28 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
