What is the difference between GPT-4 and GPT-5.1 Codex Max?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 26 challenges on Rival to see how they differ in practice.

Which is better, GPT-4 or GPT-5.1 Codex Max?

It depends on your use case. GPT-4 and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 26 challenges so you can judge which fits your needs best.

How can I compare GPT-4 and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of GPT-4 and GPT-5.1 Codex Max across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.