Gemini 2.5 Flash Preview 09-2025vsGemini 3.1 Pro Preview
Gemini 2.5 Flash Preview 09-2025 is cheaper than Gemini 3.1 Pro Preview at $0.3/M vs $2/M input tokens.
| Spec | Gemini 2.5 Flash Preview 09-2025 | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $0.3/M tokens | $2/M tokens |
| Output price | $2.5/M tokens | $12/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Released | Sep 2025 | Feb 2026 |
Our Verdict
Gemini 2.5 Flash Preview 09-2025
Gemini 3.1 Pro Preview
Not enough votes to call it. On the specs, nothing separates them.
Gemini 2.5 Flash Preview 09-2025 costs 4.8x less per token.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 09-2025
Input
$0.30
6.7× cheaper
Output
$2.50
4.8× cheaper
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 6.7× input, 4.8× output
Writing DNA
Style Comparison
Similarity
59%
Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Gemini 2.5 Flash Preview 09-2025
Gemini 3.1 Pro Preview
53%Vocabulary54%
19wSentence Length18w
0.30Hedging0.29
5.8Bold4.9
3.1Lists3.3
0.14Emoji0.00
0.93Headings0.72
0.22Transitions0.14
Based on 22 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
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