What is the difference between GPT-5.1 Chat and Grok 3 Thinking?

GPT-5.1 Chat is developed by OpenAI while Grok 3 Thinking is developed by xAI. GPT-5.1 Chat has a 128K token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 14 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 Chat or Grok 3 Thinking?

It depends on your use case. GPT-5.1 Chat and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 14 challenges so you can judge which fits your needs best.

How can I compare GPT-5.1 Chat and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of GPT-5.1 Chat and Grok 3 Thinking 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.