GPT-5.1-Codex-Mini vs GPT-5.3-Codex
Compare GPT-5.1-Codex-Mini and GPT-5.3-Codex, both from OpenAI, context windows of 400K vs 400K, tested across 53 shared challenges.
Our Verdict
GPT-5.1-Codex-Mini
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
GPT-5.1-Codex-Mini
Input
$1.50
1.2× cheaper
Output
$6.00
2.3× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
GPT-5.1-Codex-Mini is cheaper on both — 1.2× input, 2.3× output
Writing DNA
Style Comparison
Similarity
48%
GPT-5.3-Codex uses 15.8x more emoji
GPT-5.1-Codex-Mini
GPT-5.3-Codex
65%Vocabulary65%
20wSentence Length23w
0.56Hedging0.51
3.3Bold6.5
3.4Lists6.2
0.00Emoji0.16
0.08Headings1.90
0.05Transitions0.03
Based on 13 + 23 text responses
Research
What we learned reading every model
FAQ
