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

OpenAI: GPT-5.6 Sol is developed by OpenAI while xAI: Grok 4 is developed by xAI. OpenAI: GPT-5.6 Sol 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 Sol or xAI: Grok 4?

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

OpenAI: GPT-5.6 Sol costs $5/M input tokens and xAI: Grok 4 costs $3/M input tokens. xAI: Grok 4 is $2.00/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 OpenAI: GPT-5.6 Sol and xAI: Grok 4 on Rival?

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

OpenAI: GPT-5.6 Sol is developed by OpenAI while xAI: Grok 4 is developed by xAI. OpenAI: GPT-5.6 Sol 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 Sol or xAI: Grok 4?

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

OpenAI: GPT-5.6 Sol costs $5/M input tokens and xAI: Grok 4 costs $3/M input tokens. xAI: Grok 4 is $2.00/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 OpenAI: GPT-5.6 Sol and xAI: Grok 4 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Sol 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 Sol vs xAI: Grok 4: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

xAI: Grok 4Runner-up

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

Slight edge

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

xAI: Grok 4

Input

$3.00

1.7× cheaper

Output

$15.00

2.0× cheaper

xAI: Grok 4 is cheaper on both — 1.7× input, 2.0× output

Writing DNA

Style Comparison

Similarity

61%

xAI: Grok 4 uses 2.1x more emoji

OpenAI: GPT-5.6 Sol

xAI: Grok 4

63%Vocabulary53%

15wSentence Length18w

0.79Hedging0.67

3.4Bold2.7

3.8Lists2.7

0.03Emoji0.07

0.95Headings0.86

0.08Transitions0.04

Based on 27 + 21 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Sol 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 Opus 4.1New provider

xAI: Grok 4 vs GPT-5Cross-provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

xAI: Grok 4Runner-up

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

Slight edge

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

xAI: Grok 4

Input

$3.00

1.7× cheaper

Output

$15.00

2.0× cheaper

xAI: Grok 4 is cheaper on both — 1.7× input, 2.0× output

Writing DNA

Style Comparison

Similarity

61%

xAI: Grok 4 uses 2.1x more emoji

OpenAI: GPT-5.6 Sol

xAI: Grok 4

63%Vocabulary53%

15wSentence Length18w

0.79Hedging0.67

3.4Bold2.7

3.8Lists2.7

0.03Emoji0.07

0.95Headings0.86

0.08Transitions0.04

Based on 27 + 21 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Sol 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 Opus 4.1New provider

xAI: Grok 4 vs GPT-5Cross-provider