GPT-5.1 Codex Max vs GPT-5.4
Compare GPT-5.1 Codex Max and GPT-5.4, both from OpenAI, tested across 52 shared challenges. Updated April 2026.
Which is better, GPT-5.1 Codex Max or GPT-5.4?
GPT-5.1 Codex Max and GPT-5.4 are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 Codex Max and GPT-5.4
GPT-5.1 Codex Max is made by openai while GPT-5.4 is from openai.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
GPT-5.4 uses 14.9x more headings
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
