GPT-5 vs GPT-5.1-Codex
Compare GPT-5 and GPT-5.1-Codex, both from OpenAI, context windows of 400K vs 400K, tested across 52 shared challenges.
Our Verdict
GPT-5
GPT-5.1-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
Input
$1.25
Output
$10.00
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Writing DNA
Style Comparison
Similarity
61%
GPT-5.1-Codex uses 18.2x more bold
GPT-5
GPT-5.1-Codex
65%Vocabulary70%
13wSentence Length17w
0.20Hedging0.39
0.2Bold3.4
4.6Lists3.5
0.00Emoji0.00
0.16Headings0.50
0.03Transitions0.38
Based on 16 + 14 text responses
Research
What we learned reading every model
FAQ
