Kimi K2.5vsOpenAI o4-mini
Kimi K2.5 is cheaper than OpenAI o4-mini at $0.6/M vs $1.1/M input tokens.
| Spec | Kimi K2.5 | OpenAI o4-mini |
|---|---|---|
| Input price | $0.6/M tokens | $1.1/M tokens |
| Output price | $3/M tokens | $4.4/M tokens |
| Context window | 262K tokens | — |
| Released | Jan 2026 | Apr 2025 |
| SWE-bench Verified | 76.8% | 68.1% |
Our Verdict
Kimi K2.5
OpenAI o4-miniRunner-up
Not enough votes to call it. On the specs, Kimi K2.5 has the edge: bigger model tier, newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Kimi K2.5
Input
$0.60
1.8× cheaper
Output
$3.00
1.5× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Kimi K2.5 is cheaper on both — 1.8× input, 1.5× output
Writing DNA
Style Comparison
Similarity
48%
Kimi K2.5 uses 485.9x more bold
Kimi K2.5
OpenAI o4-mini
61%Vocabulary73%
21wSentence Length15w
0.55Hedging0.18
4.9Bold0.0
2.8Lists2.1
0.01Emoji0.00
0.56Headings0.00
0.17Transitions0.02
Based on 20 + 10 text responses
Research
What we learned reading every model
FAQ
Common questions
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