Claude Sonnet 4.6vsKimi K2
Kimi K2 is cheaper than Claude Sonnet 4.6 at $0.57/M vs $3/M input tokens.
| Spec | Claude Sonnet 4.6 | Kimi K2 |
|---|---|---|
| Input price | $3/M tokens | $0.57/M tokens |
| Output price | $15/M tokens | $2.3/M tokens |
| Context window | 1.0M tokens | — |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Jul 2025 |
| SWE-bench Verified | 79.0% | 65.8% |
Our Verdict
Claude Sonnet 4.6
Kimi K2
Not enough votes to call it. On the specs, nothing separates them.
Kimi K2 costs 6.5x less per token.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4.6
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.
Where to run it
5 hosts
Kimi K21 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
39%
Claude Sonnet 4.6 uses 4.4x more headings
Claude Sonnet 4.6
Kimi K2
56%Vocabulary66%
36wSentence Length19w
0.53Hedging0.34
5.1Bold3.3
3.4Lists3.4
0.19Emoji0.54
2.10Headings0.48
0.02Transitions0.05
Based on 23 + 28 text responses
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