What is the difference between GPT-5.1 and Grok 4.20 Multi-Agent Beta?

GPT-5.1 is developed by OpenAI while Grok 4.20 Multi-Agent Beta is developed by xAI. GPT-5.1 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-5.1 or Grok 4.20 Multi-Agent Beta?

It depends on your use case. GPT-5.1 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-5.1 cost compared to Grok 4.20 Multi-Agent Beta?

GPT-5.1 costs $1.25/M input tokens and Grok 4.20 Multi-Agent Beta costs $2/M input tokens. GPT-5.1 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-5.1 and Grok 4.20 Multi-Agent Beta on Rival?

This page shows a side-by-side comparison of GPT-5.1 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.

What is the difference between GPT-5.1 and Grok 4.20 Multi-Agent Beta?

GPT-5.1 is developed by OpenAI while Grok 4.20 Multi-Agent Beta is developed by xAI. GPT-5.1 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-5.1 or Grok 4.20 Multi-Agent Beta?

It depends on your use case. GPT-5.1 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-5.1 cost compared to Grok 4.20 Multi-Agent Beta?

GPT-5.1 costs $1.25/M input tokens and Grok 4.20 Multi-Agent Beta costs $2/M input tokens. GPT-5.1 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-5.1 and Grok 4.20 Multi-Agent Beta on Rival?

This page shows a side-by-side comparison of GPT-5.1 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.

GPT-5.1 vs Grok 4.20 Multi-Agent Beta: Which Is Better?

Updated Mar 2026

Our Verdict

Grok 4.20 Multi-Agent Beta

GPT-5.1Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

1.6× cheaper

Output

$10.00

Grok 4.20 Multi-Agent Beta

Input

$2.00

Output

$6.00

1.7× cheaper

GPT-5.1 wins input (1.6× cheaper)·Grok 4.20 Multi-Agent Beta wins output (1.7× cheaper)

Writing DNA

Style Comparison

Similarity

43%

GPT-5.1 uses 3.0x more lists

GPT-5.1

Grok 4.20 Multi-Agent Beta

62%Vocabulary59%

19wSentence Length16w

0.29Hedging0.41

3.5Bold2.7

7.2Lists2.4

0.00Emoji0.00

0.61Headings0.26

0.03Transitions0.02

Based on 14 + 23 text responses

Research

What we learned reading every model

GPT-5.1 and Grok 4.20 Multi-Agent 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-5.1 vs MiniMax M3New provider

GPT-5.1 vs Claude Opus 4.1New provider

GPT-5.1 vs Llama 4 MaverickNew provider

Updated Mar 2026

Our Verdict

Grok 4.20 Multi-Agent Beta

GPT-5.1Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

1.6× cheaper

Output

$10.00

Grok 4.20 Multi-Agent Beta

Input

$2.00

Output

$6.00

1.7× cheaper

GPT-5.1 wins input (1.6× cheaper)·Grok 4.20 Multi-Agent Beta wins output (1.7× cheaper)

Writing DNA

Style Comparison

Similarity

43%

GPT-5.1 uses 3.0x more lists

GPT-5.1

Grok 4.20 Multi-Agent Beta

62%Vocabulary59%

19wSentence Length16w

0.29Hedging0.41

3.5Bold2.7

7.2Lists2.4

0.00Emoji0.00

0.61Headings0.26

0.03Transitions0.02

Based on 14 + 23 text responses

Research

What we learned reading every model

GPT-5.1 and Grok 4.20 Multi-Agent 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-5.1 vs MiniMax M3New provider

GPT-5.1 vs Claude Opus 4.1New provider

GPT-5.1 vs Llama 4 MaverickNew provider