GPT-4.5vsKimi K2
Kimi K2 is cheaper than GPT-4.5 at $0.57/M vs $75/M input tokens.
| Spec | GPT-4.5 | Kimi K2 |
|---|---|---|
| Input price | $75/M tokens | $0.57/M tokens |
| Output price | $150/M tokens | $2.3/M tokens |
| Context window | 128K tokens | — |
| Released | Feb 2025 | Jul 2025 |
| SWE-bench Verified | 28.0% | 65.8% |
Our Verdict
GPT-4.5
Kimi K2
Not enough votes to call it. On the specs, nothing separates them.
Kimi K2 costs 65x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.5
Input
$75.00
Output
$150.00
Kimi K2
Input
$0.57
132× cheaper
Output
$2.30
65× cheaper
Kimi K2 is cheaper on both — 132× input, 65× output
Writing DNA
Style Comparison
Similarity
37%
Kimi K2 uses 68.5x more emoji
GPT-4.5
Kimi K2
63%Vocabulary63%
16wSentence Length19w
0.57Hedging0.35
4.7Bold4.2
6.4Lists3.6
0.00Emoji0.68
1.30Headings0.61
0.54Transitions0.06
Based on 11 + 22 text responses
Research
What we learned reading every model
FAQ
