What is the difference between GPT-5 and Grok 4.20 Beta?

GPT-5 is developed by OpenAI while Grok 4.20 Beta is developed by xAI. GPT-5 has a 400K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 or Grok 4.20 Beta?

It depends on your use case. GPT-5 and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does GPT-5 cost compared to Grok 4.20 Beta?

GPT-5 costs $1.25/M input tokens and Grok 4.20 Beta costs $2/M input tokens. GPT-5 is $0.75/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5 and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of GPT-5 and Grok 4.20 Beta 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 Mar 2026

GPT-5vsGrok 4.20 Beta

GPT-5 is cheaper than Grok 4.20 Beta at $1.25/M vs $2/M input tokens.

GPT-5 and Grok 4.20 Beta compared across 51 shared prompts
Spec	GPT-5	Grok 4.20 Beta
Input price	$1.25/M tokens	$2/M tokens
Output price	$10/M tokens	$6/M tokens
Context window	400K tokens	2.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	Mar 2026