GPT-5 ProvsKimi K2
Kimi K2 is cheaper than GPT-5 Pro at $0.57/M vs $15/M input tokens.
| Spec | GPT-5 Pro | Kimi K2 |
|---|---|---|
| Input price | $15/M tokens | $0.57/M tokens |
| Output price | $120/M tokens | $2.3/M tokens |
| Context window | 400K tokens | — |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Oct 2025 | Jul 2025 |
| SWE-bench Verified | 74.9% | 65.8% |
Our Verdict
GPT-5 Pro
Kimi K2Runner-up
Not enough votes to call it. On the specs, GPT-5 Pro has the edge: newer, bigger context window, major provider backing.
Kimi K2 costs 52x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
Kimi K2
Input
$0.57
26× cheaper
Output
$2.30
52× cheaper
Kimi K2 is cheaper on both: 26× input, 52× output.
Where to run it
2 hosts
GPT-5 Pro1 host
Kimi K21 host
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
76%
Kimi K2 uses 333.8x more bold
GPT-5 Pro
Kimi K2
65%Vocabulary66%
15wSentence Length19w
0.32Hedging0.34
0.0Bold3.3
2.9Lists3.4
0.00Emoji0.54
0.00Headings0.48
0.01Transitions0.05
Based on 11 + 28 text responses
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