What is the difference between GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta?

GPT-6 Astra Pro is developed by OpenAI while Grok 4.20 Multi-Agent Beta is developed by xAI. GPT-6 Astra Pro has a 1.1M token context window vs Grok 4.20 Multi-Agent Beta's 2.0M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, GPT-6 Astra Pro or Grok 4.20 Multi-Agent Beta?

It depends on your use case. GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How much does GPT-6 Astra Pro cost compared to Grok 4.20 Multi-Agent Beta?

GPT-6 Astra Pro costs $10/M input tokens and Grok 4.20 Multi-Agent Beta costs $2/M input tokens. Grok 4.20 Multi-Agent Beta is $8.00/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-6 Astra Pro and Grok 4.20 Multi-Agent Beta on Rival?

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

GPT-6 Astra ProvsGrok 4.20 Multi-Agent Beta

Grok 4.20 Multi-Agent Beta is cheaper than GPT-6 Astra Pro at $2/M vs $10/M input tokens.

GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta compared across 6 shared prompts
Spec	GPT-6 Astra Pro	Grok 4.20 Multi-Agent Beta
Input price	$10/M tokens	$2/M tokens
Output price	$50/M tokens	$6/M tokens
Context window	1.1M tokens	2.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Mar 2026

Our Verdict

GPT-6 Astra Pro

Grok 4.20 Multi-Agent Beta

Not enough votes to call it. On the specs, nothing separates them.

Grok 4.20 Multi-Agent Beta costs 8.3x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-6 Astra Pro

Input

$10.00

Output

$50.00

Grok 4.20 Multi-Agent Beta

Input

$2.00

5.0× cheaper

Output

$6.00

8.3× cheaper

Grok 4.20 Multi-Agent Beta is cheaper on both: 5.0× input, 8.3× output.

Where to run it

3 hosts

GPT-6 Astra Pro2 hosts

HostInOutContextUptime

Azure AI Foundry$10.00 in$50.00 out1.1M98.9% up OpenAI$10.00 in$50.00 out1.1M99.6% up

Grok 4.20 Multi-Agent Beta1 host

HostInOutContextUptime

xAI$1.25 in$2.50 out2M78.2% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

3 hosts

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta?

Which is better, GPT-6 Astra Pro or Grok 4.20 Multi-Agent Beta?

How much does GPT-6 Astra Pro cost compared to Grok 4.20 Multi-Agent Beta?

How can I compare GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

3 hosts

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta?

Which is better, GPT-6 Astra Pro or Grok 4.20 Multi-Agent Beta?

How much does GPT-6 Astra Pro cost compared to Grok 4.20 Multi-Agent Beta?

How can I compare GPT-6 Astra Pro and Grok 4.20 Multi-Agent Beta on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages