What is the difference between GPT-6 Astra Pro and Grok 3?

GPT-6 Astra Pro is developed by OpenAI while Grok 3 is developed by xAI. GPT-6 Astra Pro has a 1.1M token context window vs Grok 3's 128K. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.

Which is better, GPT-6 Astra Pro or Grok 3?

It depends on your use case. GPT-6 Astra Pro and Grok 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 5 challenges so you can judge which fits your needs best.

How can I compare GPT-6 Astra Pro and Grok 3 on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and Grok 3 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 Sep 2026

GPT-6 Astra ProvsGrok 3

GPT-6 Astra Pro has a larger context window than Grok 3 (1.1M tokens vs 128K tokens).

GPT-6 Astra Pro and Grok 3 compared across 5 shared prompts
Spec	GPT-6 Astra Pro	Grok 3
Input price	$10/M tokens	—
Output price	$50/M tokens	—
Context window	1.1M tokens	128K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Sep 2026	Feb 2025