What is the difference between GPT-5.6 Terra and Grok 4.20 Beta?

GPT-5.6 Terra is developed by OpenAI while Grok 4.20 Beta is developed by xAI. GPT-5.6 Terra has a 1.1M token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.6 Terra or Grok 4.20 Beta?

It depends on your use case. GPT-5.6 Terra and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT-5.6 Terra cost compared to Grok 4.20 Beta?

GPT-5.6 Terra costs $2.5/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 Beta is $0.50/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-5.6 Terra and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of GPT-5.6 Terra 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-5.6 Terra and Grok 4.20 Beta?

GPT-5.6 Terra is developed by OpenAI while Grok 4.20 Beta is developed by xAI. GPT-5.6 Terra has a 1.1M token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.6 Terra or Grok 4.20 Beta?

It depends on your use case. GPT-5.6 Terra and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GPT-5.6 Terra cost compared to Grok 4.20 Beta?

GPT-5.6 Terra costs $2.5/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 Beta is $0.50/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-5.6 Terra and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of GPT-5.6 Terra 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-5.6 Terra vs Grok 4.20 Beta: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.20 Beta

GPT-5.6 TerraRunner-up

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

Too close to call

What do GPT-5.6 Terra and Grok 4.20 Beta say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT-5.6 Terra

Input

$2.50

Output

$15.00

Grok 4.20 Beta

Input

$2.00

1.3× cheaper

Output

$6.00

2.5× cheaper

Grok 4.20 Beta is cheaper on both — 1.3× input, 2.5× output

Writing DNA

Style Comparison

Similarity

49%

Grok 4.20 Beta uses 2.4x more transitions

GPT-5.6 Terra

Grok 4.20 Beta

57%Vocabulary57%

18wSentence Length20w

0.85Hedging0.35

2.8Bold4.2

4.6Lists3.7

0.00Emoji0.00

1.12Headings0.62

0.06Transitions0.14

Based on 27 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.6 Terra vs Ox AlphaNew provider

GPT-5.6 Terra vs MiniMax M3New provider

Grok 4.20 Beta vs GPT-5Cross-provider

Updated Jul 2026

Our Verdict

Grok 4.20 Beta

GPT-5.6 TerraRunner-up

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

Too close to call

What do GPT-5.6 Terra and Grok 4.20 Beta say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT-5.6 Terra

Input

$2.50

Output

$15.00

Grok 4.20 Beta

Input

$2.00

1.3× cheaper

Output

$6.00

2.5× cheaper

Grok 4.20 Beta is cheaper on both — 1.3× input, 2.5× output

Writing DNA

Style Comparison

Similarity

49%

Grok 4.20 Beta uses 2.4x more transitions

GPT-5.6 Terra

Grok 4.20 Beta

57%Vocabulary57%

18wSentence Length20w

0.85Hedging0.35

2.8Bold4.2

4.6Lists3.7

0.00Emoji0.00

1.12Headings0.62

0.06Transitions0.14

Based on 27 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.6 Terra vs Ox AlphaNew provider

GPT-5.6 Terra vs MiniMax M3New provider

Grok 4.20 Beta vs GPT-5Cross-provider