Gemini 3.1 Pro PreviewvsKimi K2
Kimi K2 is cheaper than Gemini 3.1 Pro Preview at $0.57/M vs $2/M input tokens.
| Spec | Gemini 3.1 Pro Preview | Kimi K2 |
|---|---|---|
| Input price | $2/M tokens | $0.57/M tokens |
| Output price | $12/M tokens | $2.3/M tokens |
| Context window | 1.0M tokens | — |
| Released | Feb 2026 | Jul 2025 |
| SWE-bench Verified | 80.6% | 65.8% |
Our Verdict
Gemini 3.1 Pro Preview
Kimi K2Runner-up
Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: newer, bigger context window, major provider backing.
Kimi K2 costs 5.2x less per token.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
Kimi K2
Input
$0.57
3.5× cheaper
Output
$2.30
5.2× cheaper
Kimi K2 is cheaper on both — 3.5× input, 5.2× output
Writing DNA
Style Comparison
Similarity
39%
Kimi K2 uses 68.5x more emoji
Gemini 3.1 Pro Preview
Kimi K2
54%Vocabulary63%
18wSentence Length19w
0.29Hedging0.35
4.9Bold4.2
3.3Lists3.6
0.00Emoji0.68
0.72Headings0.61
0.14Transitions0.06
Based on 23 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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