Kimi K2vsOpenAI o4-mini
Kimi K2 is cheaper than OpenAI o4-mini at $0.57/M vs $1.1/M input tokens.
| Spec | Kimi K2 | OpenAI o4-mini |
|---|---|---|
| Input price | $0.57/M tokens | $1.1/M tokens |
| Output price | $2.3/M tokens | $4.4/M tokens |
| Weights | Open | Closed |
| Free API (OpenRouter) | No | No |
| Released | Jul 2025 | Apr 2025 |
| SWE-bench Verified | 65.8% | 68.1% |
Our Verdict
Kimi K2
OpenAI o4-miniRunner-up
Not enough votes to call it. On the specs, Kimi K2 has the edge: bigger model tier, newer.
Pick Kimi K2 for Web Design. Pick OpenAI o4-mini for Reasoning.
Too close to call
API pricing
Cost per 1M tokens
Kimi K2
Input
$0.57
1.9× cheaper
Output
$2.30
1.9× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Kimi K2 is cheaper on both: 1.9× input, 1.9× output.
Where to run it
2 hosts
Kimi K21 host
OpenAI o4-mini1 host
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
75%
Kimi K2 uses 333.8x more bold
Kimi K2
OpenAI o4-mini
66%Vocabulary73%
19wSentence Length21w
0.34Hedging0.39
3.3Bold0.0
3.4Lists2.0
0.54Emoji0.00
0.48Headings0.00
0.05Transitions0.05
Based on 28 + 17 text responses
Research
What we learned reading every model
FAQ
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