Gemini 3.1 Pro Preview vs GPT-5.1-Codex-Mini
Compare Gemini 3.1 Pro Preview by Google AI against GPT-5.1-Codex-Mini by OpenAI, context windows of 1.0M vs 400K, tested across 53 shared challenges.
Our Verdict
Gemini 3.1 Pro Preview
GPT-5.1-Codex-MiniRunner-up
No community votes yet. On paper, Gemini 3.1 Pro Preview has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
GPT-5.1-Codex-Mini
Input
$1.50
1.3× cheaper
Output
$6.00
2.0× cheaper
GPT-5.1-Codex-Mini is cheaper on both — 1.3× input, 2.0× output
Writing DNA
Style Comparison
Similarity
43%
Gemini 3.1 Pro Preview uses 9.3x more headings
Gemini 3.1 Pro Preview
GPT-5.1-Codex-Mini
54%Vocabulary65%
18wSentence Length20w
0.29Hedging0.56
4.9Bold3.3
3.3Lists3.4
0.00Emoji0.00
0.72Headings0.08
0.14Transitions0.05
Based on 23 + 13 text responses
Research
What we learned reading every model
FAQ
