What is the difference between OpenAI: GPT-5.6 Sol and xAI: Grok 4.5?

OpenAI: GPT-5.6 Sol is developed by OpenAI while xAI: Grok 4.5 is developed by xAI. OpenAI: GPT-5.6 Sol has a 1.1M token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Sol or xAI: Grok 4.5?

It depends on your use case. OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does OpenAI: GPT-5.6 Sol cost compared to xAI: Grok 4.5?

OpenAI: GPT-5.6 Sol costs $5/M input tokens and xAI: Grok 4.5 costs $2/M input tokens. xAI: Grok 4.5 is $3.00/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 4.5 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 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 4.5?

OpenAI: GPT-5.6 Sol is developed by OpenAI while xAI: Grok 4.5 is developed by xAI. OpenAI: GPT-5.6 Sol has a 1.1M token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Sol or xAI: Grok 4.5?

It depends on your use case. OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does OpenAI: GPT-5.6 Sol cost compared to xAI: Grok 4.5?

OpenAI: GPT-5.6 Sol costs $5/M input tokens and xAI: Grok 4.5 costs $2/M input tokens. xAI: Grok 4.5 is $3.00/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 4.5 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 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 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

xAI: Grok 4.5Runner-up

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

xAI: Grok 4.5 is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

xAI: Grok 4.5

Input

$2.00

2.5× cheaper

Output

$6.00

5.0× cheaper

xAI: Grok 4.5 is cheaper on both — 2.5× input, 5.0× output

Writing DNA

Style Comparison

Similarity

65%

OpenAI: GPT-5.6 Sol uses 3.5x more hedging

OpenAI: GPT-5.6 Sol

xAI: Grok 4.5

63%Vocabulary61%

15wSentence Length16w

0.79Hedging0.23

3.4Bold2.5

3.8Lists2.4

0.03Emoji0.09

0.95Headings0.48

0.08Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 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 4.5 vs MiniMax M3New provider

xAI: Grok 4.5 vs Claude Opus 4.1New provider

xAI: Grok 4.5 vs GPT-5Cross-provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

xAI: Grok 4.5Runner-up

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

xAI: Grok 4.5 is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Sol

Input

$5.00

Output

$30.00

xAI: Grok 4.5

Input

$2.00

2.5× cheaper

Output

$6.00

5.0× cheaper

xAI: Grok 4.5 is cheaper on both — 2.5× input, 5.0× output

Writing DNA

Style Comparison

Similarity

65%

OpenAI: GPT-5.6 Sol uses 3.5x more hedging

OpenAI: GPT-5.6 Sol

xAI: Grok 4.5

63%Vocabulary61%

15wSentence Length16w

0.79Hedging0.23

3.4Bold2.5

3.8Lists2.4

0.03Emoji0.09

0.95Headings0.48

0.08Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Sol and xAI: Grok 4.5 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 4.5 vs MiniMax M3New provider

xAI: Grok 4.5 vs Claude Opus 4.1New provider

xAI: Grok 4.5 vs GPT-5Cross-provider