Gemini 3.6 Flash vs GPT-5.3-Codex
Compare Gemini 3.6 Flash by Google AI against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 53 shared challenges.
Our Verdict
Gemini 3.6 Flash
GPT-5.3-Codex
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 3.6 Flash
Input
$1.50
1.2× cheaper
Output
$7.50
1.9× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
Gemini 3.6 Flash is cheaper on both — 1.2× input, 1.9× output
Writing DNA
Style Comparison
Similarity
58%
GPT-5.3-Codex uses 4.1x more hedging
Gemini 3.6 Flash
GPT-5.3-Codex
60%Vocabulary65%
19wSentence Length23w
0.13Hedging0.51
5.4Bold6.5
2.7Lists6.2
0.04Emoji0.16
0.99Headings1.90
0.07Transitions0.03
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
