GPT-5.1 Codex Max vs GPT-5.5
Compare GPT-5.1 Codex Max and GPT-5.5, both from OpenAI, tested across 52 shared challenges.
Our Verdict
GPT-5.1 Codex Max
GPT-5.5
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-5.5
Input
$5.00
Output
$30.00
Writing DNA
Style Comparison
Similarity
44%
GPT-5.5 uses 13.6x more headings
GPT-5.1 Codex Max
GPT-5.5
60%Vocabulary58%
16wSentence Length18w
0.36Hedging0.74
2.3Bold2.9
4.2Lists5.1
0.00Emoji0.00
0.12Headings1.68
0.03Transitions0.03
Based on 13 + 26 text responses
Research
What we learned reading every model
FAQ
