What is the difference between OpenAI: GPT-5.6 Terra and xAI: Grok 4?

OpenAI: GPT-5.6 Terra is developed by OpenAI while xAI: Grok 4 is developed by xAI. OpenAI: GPT-5.6 Terra has a 1.1M token context window vs xAI: Grok 4's 256K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Terra or xAI: Grok 4?

It depends on your use case. OpenAI: GPT-5.6 Terra and xAI: Grok 4 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 OpenAI: GPT-5.6 Terra cost compared to xAI: Grok 4?

OpenAI: GPT-5.6 Terra costs $2.5/M input tokens and xAI: Grok 4 costs $3/M input tokens. OpenAI: GPT-5.6 Terra 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 OpenAI: GPT-5.6 Terra and xAI: Grok 4 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Terra and xAI: Grok 4 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 OpenAI: GPT-5.6 Terra and xAI: Grok 4?

OpenAI: GPT-5.6 Terra is developed by OpenAI while xAI: Grok 4 is developed by xAI. OpenAI: GPT-5.6 Terra has a 1.1M token context window vs xAI: Grok 4's 256K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Terra or xAI: Grok 4?

It depends on your use case. OpenAI: GPT-5.6 Terra and xAI: Grok 4 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 OpenAI: GPT-5.6 Terra cost compared to xAI: Grok 4?

OpenAI: GPT-5.6 Terra costs $2.5/M input tokens and xAI: Grok 4 costs $3/M input tokens. OpenAI: GPT-5.6 Terra 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 OpenAI: GPT-5.6 Terra and xAI: Grok 4 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Terra and xAI: Grok 4 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.

OpenAI: GPT-5.6 Terra vs xAI: Grok 4: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Terra

xAI: Grok 4Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Terra

Input

$2.50

1.2× cheaper

Output

$15.00

xAI: Grok 4

Input

$3.00

Output

$15.00

Writing DNA

Style Comparison

Similarity

69%

xAI: Grok 4 uses 7.0x more emoji

OpenAI: GPT-5.6 Terra

xAI: Grok 4

57%Vocabulary53%

18wSentence Length18w

0.85Hedging0.67

2.8Bold2.7

4.6Lists2.7

0.00Emoji0.07

1.12Headings0.86

0.06Transitions0.04

Based on 27 + 21 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Terra and xAI: Grok 4 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

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xAI: Grok 4 vs Gemini 2.5 Pro Preview 06-05New provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Terra

xAI: Grok 4Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Terra

Input

$2.50

1.2× cheaper

Output

$15.00

xAI: Grok 4

Input

$3.00

Output

$15.00

Writing DNA

Style Comparison

Similarity

69%

xAI: Grok 4 uses 7.0x more emoji

OpenAI: GPT-5.6 Terra

xAI: Grok 4

57%Vocabulary53%

18wSentence Length18w

0.85Hedging0.67

2.8Bold2.7

4.6Lists2.7

0.00Emoji0.07

1.12Headings0.86

0.06Transitions0.04

Based on 27 + 21 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Terra and xAI: Grok 4 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

xAI: Grok 4 vs MiniMax M3New provider

xAI: Grok 4 vs Claude Sonnet 4New provider

xAI: Grok 4 vs Gemini 2.5 Pro Preview 06-05New provider