GPT-5.1-Codex-Mini vs GPT-5.3 Chat
Compare GPT-5.1-Codex-Mini and GPT-5.3 Chat, both from OpenAI, context windows of 400K vs 128K, tested across 53 shared challenges.
Our Verdict
GPT-5.1-Codex-Mini
GPT-5.3 ChatRunner-up
No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger model tier, bigger context window.
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 Chat
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
66%
GPT-5.1-Codex-Mini uses 7.7x more headings
GPT-5.1-Codex-Mini
GPT-5.3 Chat
65%Vocabulary59%
20wSentence Length26w
0.56Hedging0.84
3.3Bold1.7
3.4Lists6.6
0.00Emoji0.00
0.08Headings0.00
0.05Transitions0.25
Based on 13 + 23 text responses
Research
What we learned reading every model
FAQ
