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

GPT-5 Pro is developed by OpenAI while Grok 4.20 Beta is developed by xAI. GPT-5 Pro has a 400K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5 Pro and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

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

GPT-5 Pro costs $15/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 Beta is $13.00/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-5 Pro and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of GPT-5 Pro 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.

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

GPT-5 Pro is developed by OpenAI while Grok 4.20 Beta is developed by xAI. GPT-5 Pro has a 400K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5 Pro and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

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

GPT-5 Pro costs $15/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 Beta is $13.00/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-5 Pro and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of GPT-5 Pro 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.

GPT-5 Pro vs Grok 4.20 Beta: Which Is Better?

Updated Mar 2026

Our Verdict

Grok 4.20 Beta

GPT-5 ProRunner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.

Grok 4.20 Beta is 20x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-5 Pro

Input

$15.00

Output

$120.00

Grok 4.20 Beta

Input

$2.00

7.5× cheaper

Output

$6.00

20× cheaper

Grok 4.20 Beta is cheaper on both — 7.5× input, 20× output

Writing DNA

Style Comparison

Similarity

60%

Grok 4.20 Beta uses 417.7x more bold

GPT-5 Pro

Grok 4.20 Beta

65%Vocabulary57%

15wSentence Length20w

0.32Hedging0.35

0.0Bold4.2

2.9Lists3.7

0.00Emoji0.00

0.00Headings0.62

0.01Transitions0.14

Based on 11 + 23 text responses

Research

What we learned reading every model

GPT-5 Pro and Grok 4.20 Beta have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Pro vs MiniMax M3New provider

Grok 4.20 Beta vs GPT-5Cross-provider

GPT-5 Pro vs Claude Opus 4New provider

Updated Mar 2026

Our Verdict

Grok 4.20 Beta

GPT-5 ProRunner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.

Grok 4.20 Beta is 20x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT-5 Pro

Input

$15.00

Output

$120.00

Grok 4.20 Beta

Input

$2.00

7.5× cheaper

Output

$6.00

20× cheaper

Grok 4.20 Beta is cheaper on both — 7.5× input, 20× output

Writing DNA

Style Comparison

Similarity

60%

Grok 4.20 Beta uses 417.7x more bold

GPT-5 Pro

Grok 4.20 Beta

65%Vocabulary57%

15wSentence Length20w

0.32Hedging0.35

0.0Bold4.2

2.9Lists3.7

0.00Emoji0.00

0.00Headings0.62

0.01Transitions0.14

Based on 11 + 23 text responses

Research

What we learned reading every model

GPT-5 Pro and Grok 4.20 Beta have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Pro vs MiniMax M3New provider

Grok 4.20 Beta vs GPT-5Cross-provider

GPT-5 Pro vs Claude Opus 4New provider