Gemini 3.1 Pro Preview vs GPT-5.3-Codex
Compare Gemini 3.1 Pro Preview by Google AI against GPT-5.3-Codex by OpenAI, in 7 community votes, gemini 3.1 pro preview wins 86% of head-to-head duels, context windows of 1.0M vs 400K, tested across 53 shared challenges.
Image Generation: Gemini 3.1 Pro Preview wins 100% of votes
Our Verdict
Gemini 3.1 Pro PreviewWinner
GPT-5.3-CodexRunner-up
Pick Gemini 3.1 Pro Preview. In 7 blind votes, Gemini 3.1 Pro Preview wins 86% of the time. That's not luck.
Gemini 3.1 Pro Preview particularly excels in Image Generation.
Clear winner
API pricing
Cost per 1M tokens
Gemini 3.1 Pro Preview
Input
$2.00
Output
$12.00
1.2× cheaper
GPT-5.3-Codex
Input
$1.75
1.1× cheaper
Output
$14.00
GPT-5.3-Codex wins input (1.1× cheaper)·Gemini 3.1 Pro Preview wins output (1.2× cheaper)
Writing DNA
Style Comparison
Similarity
27%
GPT-5.3-Codex uses 15.8x more emoji
Gemini 3.1 Pro Preview
GPT-5.3-Codex
54%Vocabulary65%
18wSentence Length23w
0.29Hedging0.51
4.9Bold6.5
3.3Lists6.2
0.00Emoji0.16
0.72Headings1.90
0.14Transitions0.03
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
