What is the difference between GPT-5 Pro and GPT-5.1 Codex Max?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Pro or GPT-5.1 Codex Max?

It depends on your use case. GPT-5 Pro and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

How can I compare GPT-5 Pro and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of GPT-5 Pro 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.

What is the difference between GPT-5 Pro and GPT-5.1 Codex Max?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Pro or GPT-5.1 Codex Max?

It depends on your use case. GPT-5 Pro and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

How can I compare GPT-5 Pro and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of GPT-5 Pro 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.

GPT-5 Pro vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5 Pro

GPT-5.1 Codex Max

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 Pro

Input

$15.00

Output

$120.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

79%

GPT-5.1 Codex Max uses 225.1x more bold

GPT-5 Pro

GPT-5.1 Codex Max

65%Vocabulary60%

15wSentence Length16w

0.32Hedging0.36

0.0Bold2.3

2.9Lists4.2

0.00Emoji0.00

0.00Headings0.12

0.01Transitions0.03

Based on 11 + 13 text responses

Research

What we learned reading every model

GPT-5 Pro and GPT-5.1 Codex Max have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Pro vs MiniMax M3New provider

GPT-5 Pro vs Grok 3New provider

GPT-5 Pro vs Llama 4 MaverickNew provider

Updated Dec 2025

Our Verdict

GPT-5 Pro

GPT-5.1 Codex Max

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 Pro

Input

$15.00

Output

$120.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

79%

GPT-5.1 Codex Max uses 225.1x more bold

GPT-5 Pro

GPT-5.1 Codex Max

65%Vocabulary60%

15wSentence Length16w

0.32Hedging0.36

0.0Bold2.3

2.9Lists4.2

0.00Emoji0.00

0.00Headings0.12

0.01Transitions0.03

Based on 11 + 13 text responses

Research

What we learned reading every model

GPT-5 Pro and GPT-5.1 Codex Max have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Pro vs MiniMax M3New provider

GPT-5 Pro vs Grok 3New provider

GPT-5 Pro vs Llama 4 MaverickNew provider