What is the difference between Claude Sonnet 4 and xAI: Grok 4.5?

Claude Sonnet 4 is developed by Anthropic while xAI: Grok 4.5 is developed by xAI. Claude Sonnet 4 has a 200K token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4 or xAI: Grok 4.5?

It depends on your use case. Claude Sonnet 4 and xAI: Grok 4.5 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 Claude Sonnet 4 cost compared to xAI: Grok 4.5?

Claude Sonnet 4 costs $3/M input tokens and xAI: Grok 4.5 costs $2/M input tokens. xAI: Grok 4.5 is $1.00/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 Claude Sonnet 4 and xAI: Grok 4.5 on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4 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 Claude Sonnet 4 and xAI: Grok 4.5?

Claude Sonnet 4 is developed by Anthropic while xAI: Grok 4.5 is developed by xAI. Claude Sonnet 4 has a 200K token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4 or xAI: Grok 4.5?

It depends on your use case. Claude Sonnet 4 and xAI: Grok 4.5 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 Claude Sonnet 4 cost compared to xAI: Grok 4.5?

Claude Sonnet 4 costs $3/M input tokens and xAI: Grok 4.5 costs $2/M input tokens. xAI: Grok 4.5 is $1.00/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 Claude Sonnet 4 and xAI: Grok 4.5 on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4 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.

Claude Sonnet 4 vs xAI: Grok 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

Claude Sonnet 4Runner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4

Input

$3.00

Output

$15.00

xAI: Grok 4.5

Input

$2.00

1.5× cheaper

Output

$6.00

2.5× cheaper

xAI: Grok 4.5 is cheaper on both — 1.5× input, 2.5× output

Writing DNA

Style Comparison

Similarity

37%

Claude Sonnet 4 uses 9.8x more emoji

Claude Sonnet 4

xAI: Grok 4.5

62%Vocabulary61%

111wSentence Length16w

0.40Hedging0.23

5.0Bold2.5

9.3Lists2.4

0.88Emoji0.09

2.16Headings0.48

0.33Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4 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 GPT-5New provider

xAI: Grok 4.5 vs Claude Opus 4Cross-provider

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

Claude Sonnet 4Runner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4

Input

$3.00

Output

$15.00

xAI: Grok 4.5

Input

$2.00

1.5× cheaper

Output

$6.00

2.5× cheaper

xAI: Grok 4.5 is cheaper on both — 1.5× input, 2.5× output

Writing DNA

Style Comparison

Similarity

37%

Claude Sonnet 4 uses 9.8x more emoji

Claude Sonnet 4

xAI: Grok 4.5

62%Vocabulary61%

111wSentence Length16w

0.40Hedging0.23

5.0Bold2.5

9.3Lists2.4

0.88Emoji0.09

2.16Headings0.48

0.33Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4 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 GPT-5New provider

xAI: Grok 4.5 vs Claude Opus 4Cross-provider