Gemini 3 Flash PreviewvsGPT-5.1
Gemini 3 Flash Preview is cheaper than GPT-5.1 at $0.5/M vs $1.25/M input tokens.
| Spec | Gemini 3 Flash Preview | GPT-5.1 |
|---|---|---|
| Input price | $0.5/M tokens | $1.25/M tokens |
| Output price | $3/M tokens | $10/M tokens |
| Context window | 1.0M tokens | 400K tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Dec 2025 | Nov 2025 |
| SWE-bench Verified | 78.0% | 76.3% |
Our Verdict
Gemini 3 Flash Preview
GPT-5.1
Not enough votes to call it. On the specs, nothing separates them.
Gemini 3 Flash Preview costs 3.3x less per token.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3 Flash Preview
Input
$0.50
2.5× cheaper
Output
$3.00
3.3× cheaper
GPT-5.1
Input
$1.25
Output
$10.00
Gemini 3 Flash Preview is cheaper on both: 2.5× input, 3.3× output.
Where to run it
4 hosts, cheapest first
Gemini 3 Flash Preview2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
55%
Gemini 3 Flash Preview uses 3.1x more transitions
Gemini 3 Flash Preview
GPT-5.1
57%Vocabulary62%
18wSentence Length19w
0.41Hedging0.29
7.4Bold3.5
4.2Lists7.2
0.00Emoji0.00
0.77Headings0.61
0.08Transitions0.03
Based on 28 + 14 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
