What is the difference between Claude 3.7 Thinking Sonnet and Grok 4.1 Fast?

Claude 3.7 Thinking Sonnet is developed by Anthropic while Grok 4.1 Fast is developed by xAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Thinking Sonnet or Grok 4.1 Fast?

It depends on your use case. Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 can I compare Claude 3.7 Thinking Sonnet and Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 3.7 Thinking Sonnet and Grok 4.1 Fast?

Claude 3.7 Thinking Sonnet is developed by Anthropic while Grok 4.1 Fast is developed by xAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Thinking Sonnet or Grok 4.1 Fast?

It depends on your use case. Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 can I compare Claude 3.7 Thinking Sonnet and Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 3.7 Thinking Sonnet vs Grok 4.1 Fast: Which Is Better?

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

Claude 3.7 Thinking SonnetRunner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Thinking Sonnet

Input

$6.00

Output

$30.00

Grok 4.1 Fast

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

42%

Claude 3.7 Thinking Sonnet uses 3.7x more hedging

Claude 3.7 Thinking Sonnet

Grok 4.1 Fast

61%Vocabulary67%

49wSentence Length15w

0.64Hedging0.17

2.2Bold4.7

4.5Lists3.7

0.00Emoji0.00

1.81Headings0.99

0.21Transitions0.14

Based on 21 + 24 text responses

Research

What we learned reading every model

Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 3.7 Thinking Sonnet vs MiniMax M3New provider

Claude 3.7 Thinking Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Thinking Sonnet vs GPT-5New provider

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

Claude 3.7 Thinking SonnetRunner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Thinking Sonnet

Input

$6.00

Output

$30.00

Grok 4.1 Fast

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

42%

Claude 3.7 Thinking Sonnet uses 3.7x more hedging

Claude 3.7 Thinking Sonnet

Grok 4.1 Fast

61%Vocabulary67%

49wSentence Length15w

0.64Hedging0.17

2.2Bold4.7

4.5Lists3.7

0.00Emoji0.00

1.81Headings0.99

0.21Transitions0.14

Based on 21 + 24 text responses

Research

What we learned reading every model

Claude 3.7 Thinking Sonnet and Grok 4.1 Fast 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 3.7 Thinking Sonnet vs MiniMax M3New provider

Claude 3.7 Thinking Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Thinking Sonnet vs GPT-5New provider