What is the difference between GPT-5.2 Pro and Grok 3 Thinking?

GPT-5.2 Pro is developed by OpenAI while Grok 3 Thinking is developed by xAI. GPT-5.2 Pro has a 400K token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.2 Pro or Grok 3 Thinking?

It depends on your use case. GPT-5.2 Pro and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.

How can I compare GPT-5.2 Pro and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of GPT-5.2 Pro 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.

Updated Dec 2025

GPT-5.2 ProvsGrok 3 Thinking

GPT-5.2 Pro has a larger context window than Grok 3 Thinking (400K tokens vs 128K tokens).

GPT-5.2 Pro and Grok 3 Thinking compared across 7 shared prompts
Spec	GPT-5.2 Pro	Grok 3 Thinking
Input price	$21/M tokens	—
Output price	$168/M tokens	—
Context window	400K tokens	128K tokens
Weights	Closed	—
Free API (OpenRouter)	No	—
Released	Dec 2025	Feb 2025