GPT-4.1vsKimi K2
Kimi K2 is cheaper than GPT-4.1 at $0.57/M vs $2/M input tokens.
| Spec | GPT-4.1 | Kimi K2 |
|---|---|---|
| Input price | $2/M tokens | $0.57/M tokens |
| Output price | $8/M tokens | $2.3/M tokens |
| Context window | 1.0M tokens | — |
| Released | Apr 2025 | Jul 2025 |
| SWE-bench Verified | 54.6% | 65.8% |
Our Verdict
GPT-4.1
Kimi K2
Not enough votes to call it. On the specs, nothing separates them.
Kimi K2 costs 3.5x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.1
Input
$2.00
Output
$8.00
Kimi K2
Input
$0.57
3.5× cheaper
Output
$2.30
3.5× cheaper
Kimi K2 is cheaper on both — 3.5× input, 3.5× output
Writing DNA
Style Comparison
Similarity
39%
GPT-4.1 uses 2.6x more bold
GPT-4.1
Kimi K2
58%Vocabulary66%
19wSentence Length19w
0.49Hedging0.34
8.8Bold3.3
5.8Lists3.4
0.22Emoji0.54
1.01Headings0.48
0.10Transitions0.05
Based on 27 + 28 text responses
Research
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