GPT-5 Codex vs GPT-5.3-Codex
Compare GPT-5 Codex and GPT-5.3-Codex, both from OpenAI, tested across 49 shared challenges.
Our Verdict
GPT-5 Codex
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 Codex
Input
—
Output
—
GPT-5.3-Codex
Input
$1.75
Output
$14.00
Writing DNA
Style Comparison
Similarity
56%
GPT-5.3-Codex uses 3.9x more headings
GPT-5 Codex
GPT-5.3-Codex
64%Vocabulary65%
17wSentence Length23w
0.38Hedging0.51
2.3Bold6.5
3.5Lists6.2
0.15Emoji0.16
0.49Headings1.90
0.05Transitions0.03
Based on 13 + 23 text responses
Research
What we learned reading every model
FAQ
