What is the difference between Claude Sonnet 4.5 and Grok 3 Thinking?

Claude Sonnet 4.5 is developed by Anthropic while Grok 3 Thinking is developed by xAI. Claude Sonnet 4.5 has a 200K token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.5 or Grok 3 Thinking?

It depends on your use case. Claude Sonnet 4.5 and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How can I compare Claude Sonnet 4.5 and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Grok 3 Thinking 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 4.5 and Grok 3 Thinking?

Claude Sonnet 4.5 is developed by Anthropic while Grok 3 Thinking is developed by xAI. Claude Sonnet 4.5 has a 200K token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4.5 or Grok 3 Thinking?

It depends on your use case. Claude Sonnet 4.5 and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How can I compare Claude Sonnet 4.5 and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4.5 and Grok 3 Thinking 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 4.5 vs Grok 3 Thinking: Which Is Better?

Updated Sep 2025

Our Verdict

Claude Sonnet 4.5

Grok 3 Thinking

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

Grok 3 Thinking

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

38%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Grok 3 Thinking

64%Vocabulary46%

94wSentence Length19w

0.48Hedging1.11

4.9Bold3.3

8.0Lists2.6

0.45Emoji0.00

1.91Headings0.64

0.07Transitions0.25

Based on 20 + 6 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Grok 3 Thinking 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

Claude Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs Gemini 2.5 Pro Preview 06-05New provider

Claude Sonnet 4.5 vs GPT-5New provider

Updated Sep 2025

Our Verdict

Claude Sonnet 4.5

Grok 3 Thinking

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4.5

Input

$3.00

Output

$15.00

Grok 3 Thinking

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

38%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Grok 3 Thinking

64%Vocabulary46%

94wSentence Length19w

0.48Hedging1.11

4.9Bold3.3

8.0Lists2.6

0.45Emoji0.00

1.91Headings0.64

0.07Transitions0.25

Based on 20 + 6 text responses

Research

What we learned reading every model

Claude Sonnet 4.5 and Grok 3 Thinking 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

Claude Sonnet 4.5 vs MiniMax M3New provider

Claude Sonnet 4.5 vs Gemini 2.5 Pro Preview 06-05New provider

Claude Sonnet 4.5 vs GPT-5New provider