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

GPT-5 is developed by OpenAI while Grok 4.20 Multi-Agent Beta is developed by xAI. GPT-5 has a 400K token context window vs Grok 4.20 Multi-Agent 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 Multi-Agent Beta?

It depends on your use case. GPT-5 and Grok 4.20 Multi-Agent 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 Multi-Agent Beta?

GPT-5 costs $1.25/M input tokens and Grok 4.20 Multi-Agent 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 Multi-Agent Beta on Rival?

This page shows a side-by-side comparison of GPT-5 and Grok 4.20 Multi-Agent 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 Multi-Agent Beta

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

GPT-5 and Grok 4.20 Multi-Agent Beta compared across 51 shared prompts
Spec	GPT-5	Grok 4.20 Multi-Agent 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