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

Claude 3.7 Thinking 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 Thinking Sonnet or GPT-5.1 Codex Max?

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

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

Claude 3.7 Thinking 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 Thinking Sonnet or GPT-5.1 Codex Max?

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

This page shows a side-by-side comparison of Claude 3.7 Thinking 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 Thinking Sonnet vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Claude 3.7 Thinking SonnetRunner-up

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

Too close to call

What do Claude 3.7 Thinking Sonnet and GPT-5.1 Codex Max say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude 3.7 Thinking Sonnet

Input

$6.00

Output

$30.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

41%

Claude 3.7 Thinking Sonnet uses 14.6x more headings

Claude 3.7 Thinking Sonnet

GPT-5.1 Codex Max

61%Vocabulary60%

49wSentence Length16w

0.64Hedging0.36

2.2Bold2.3

4.5Lists4.2

0.00Emoji0.00

1.81Headings0.12

0.21Transitions0.03

Based on 21 + 13 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude 3.7 Thinking Sonnet vs Ox AlphaNew provider

Claude 3.7 Thinking Sonnet vs MiniMax M3New provider

Claude 3.7 Thinking Sonnet vs Llama 4 MaverickNew provider

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Claude 3.7 Thinking SonnetRunner-up

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

Too close to call

What do Claude 3.7 Thinking Sonnet and GPT-5.1 Codex Max say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude 3.7 Thinking Sonnet

Input

$6.00

Output

$30.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

41%

Claude 3.7 Thinking Sonnet uses 14.6x more headings

Claude 3.7 Thinking Sonnet

GPT-5.1 Codex Max

61%Vocabulary60%

49wSentence Length16w

0.64Hedging0.36

2.2Bold2.3

4.5Lists4.2

0.00Emoji0.00

1.81Headings0.12

0.21Transitions0.03

Based on 21 + 13 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Claude 3.7 Thinking Sonnet vs Ox AlphaNew provider

Claude 3.7 Thinking Sonnet vs MiniMax M3New provider

Claude 3.7 Thinking Sonnet vs Llama 4 MaverickNew provider