GPT-5.1 Codex Max vs GPT-5.4 Pro
Compare GPT-5.1 Codex Max and GPT-5.4 Pro, both from OpenAI, tested across 18 shared challenges.
Our Verdict
GPT-5.1 Codex Max
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-5.1 Codex Max
Input
—
Output
—
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Writing DNA
Style Comparison
Similarity
30%
GPT-5.4 Pro uses 20.4x more headings
GPT-5.1 Codex Max
GPT-5.4 Pro
60%Vocabulary50%
16wSentence Length35w
0.36Hedging0.70
2.3Bold7.5
4.2Lists8.3
0.00Emoji0.00
0.12Headings2.52
0.03Transitions0.01
Based on 13 + 12 text responses
Research
What we learned reading every model
FAQ
