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.

Updated Dec 2025

Claude 3.7 SonnetvsGPT-5.1 Codex Max

GPT-5.1 Codex Max is the newer model, released after Claude 3.7 Sonnet.

Claude 3.7 Sonnet and GPT-5.1 Codex Max compared across 53 shared prompts
Spec	Claude 3.7 Sonnet	GPT-5.1 Codex Max
Input price	$3/M tokens	—
Output price	$15/M tokens	—
Context window	200K tokens	—
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Feb 2025	Dec 2025
SWE-bench Verified	70.3%	77.9%