Gemini 3 Flash Preview vs GPT-5.1-Codex-Mini
Compare Gemini 3 Flash Preview by Google AI against GPT-5.1-Codex-Mini by OpenAI, context windows of 1.0M vs 400K, tested across 55 shared challenges.
Our Verdict
Gemini 3 Flash Preview
GPT-5.1-Codex-Mini
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3 Flash Preview
Input
$0.50
3.0× cheaper
Output
$3.00
2.0× cheaper
GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00
Gemini 3 Flash Preview is cheaper on both — 3.0× input, 2.0× output
Writing DNA
Style Comparison
Similarity
43%
Gemini 3 Flash Preview uses 10.9x more headings
Gemini 3 Flash Preview
GPT-5.1-Codex-Mini
55%Vocabulary65%
18wSentence Length20w
0.42Hedging0.56
7.1Bold3.3
4.5Lists3.4
0.00Emoji0.00
0.84Headings0.08
0.07Transitions0.05
Based on 24 + 13 text responses
Research
What we learned reading every model
FAQ
