What is the difference between Claude 3.7 Sonnet and GPT-5.1 Codex Max?

Claude 3.7 Sonnet is developed by Anthropic while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Sonnet or GPT-5.1 Codex Max?

It depends on your use case. Claude 3.7 Sonnet 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 Claude 3.7 Sonnet and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet 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 Claude 3.7 Sonnet and GPT-5.1 Codex Max?

Claude 3.7 Sonnet is developed by Anthropic while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Sonnet or GPT-5.1 Codex Max?

It depends on your use case. Claude 3.7 Sonnet 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 Claude 3.7 Sonnet and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet 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.

Claude 3.7 Sonnet vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Claude 3.7 SonnetRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

56%

Claude 3.7 Sonnet uses 14.4x more headings

Claude 3.7 Sonnet

GPT-5.1 Codex Max

62%Vocabulary60%

35wSentence Length16w

0.99Hedging0.36

1.2Bold2.3

4.3Lists4.2

0.00Emoji0.00

1.78Headings0.12

0.23Transitions0.03

Based on 13 + 13 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet 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

Claude 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Sonnet vs Grok 3New provider

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Claude 3.7 SonnetRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

56%

Claude 3.7 Sonnet uses 14.4x more headings

Claude 3.7 Sonnet

GPT-5.1 Codex Max

62%Vocabulary60%

35wSentence Length16w

0.99Hedging0.36

1.2Bold2.3

4.3Lists4.2

0.00Emoji0.00

1.78Headings0.12

0.23Transitions0.03

Based on 13 + 13 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet 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

Claude 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Sonnet vs Grok 3New provider