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

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5.1 Chat and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

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

This page shows a side-by-side comparison of GPT-5.1 Chat 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-5.1 Chat and GPT-5.1 Codex Max?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5.1 Chat and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

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

This page shows a side-by-side comparison of GPT-5.1 Chat 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-5.1 Chat vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

GPT-5.1 ChatRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1 Chat

Input

$1.25

Output

$10.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

59%

GPT-5.1 Codex Max uses 12.3x more headings

GPT-5.1 Chat

GPT-5.1 Codex Max

73%Vocabulary60%

18wSentence Length16w

0.45Hedging0.36

1.1Bold2.3

2.4Lists4.2

0.00Emoji0.00

0.00Headings0.12

0.06Transitions0.03

Based on 15 + 13 text responses

Research

What we learned reading every model

GPT-5.1 Chat 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-5.1 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Grok 3New provider

GPT-5.1 Chat vs Llama 4 MaverickNew provider

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

GPT-5.1 ChatRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1 Chat

Input

$1.25

Output

$10.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

59%

GPT-5.1 Codex Max uses 12.3x more headings

GPT-5.1 Chat

GPT-5.1 Codex Max

73%Vocabulary60%

18wSentence Length16w

0.45Hedging0.36

1.1Bold2.3

2.4Lists4.2

0.00Emoji0.00

0.00Headings0.12

0.06Transitions0.03

Based on 15 + 13 text responses

Research

What we learned reading every model

GPT-5.1 Chat 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-5.1 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Grok 3New provider

GPT-5.1 Chat vs Llama 4 MaverickNew provider