GPT-5 Codex vs GPT-5.4 Pro
Compare GPT-5 Codex and GPT-5.4 Pro, both from OpenAI, tested across 16 shared challenges.
Our Verdict
GPT-5 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.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Codex
Input
—
Output
—
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Writing DNA
Style Comparison
Similarity
42%
GPT-5 Codex uses 14.6x more emoji
GPT-5 Codex
GPT-5.4 Pro
64%Vocabulary50%
17wSentence Length35w
0.38Hedging0.70
2.3Bold7.5
3.5Lists8.3
0.15Emoji0.00
0.49Headings2.52
0.05Transitions0.01
Based on 13 + 12 text responses
Research
What we learned reading every model
FAQ
