GPT-5.3-Codex vs GPT-5.4 Pro
Compare GPT-5.3-Codex and GPT-5.4 Pro, both from OpenAI, context windows of 400K vs 1.1M, tested across 18 shared challenges.
Our Verdict
GPT-5.3-Codex
GPT-5.4 Pro
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.3-Codex is 13x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.3-Codex
Input
$1.75
17× cheaper
Output
$14.00
13× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
GPT-5.3-Codex is cheaper on both — 17× input, 13× output
Writing DNA
Style Comparison
Similarity
75%
GPT-5.3-Codex uses 15.8x more emoji
GPT-5.3-Codex
GPT-5.4 Pro
65%Vocabulary50%
23wSentence Length35w
0.51Hedging0.70
6.5Bold7.5
6.2Lists8.3
0.16Emoji0.00
1.90Headings2.52
0.03Transitions0.01
Based on 23 + 12 text responses
Research
What we learned reading every model
FAQ
