What is the difference between Claude Opus 5 and Grok 3 Thinking?

Claude Opus 5 is developed by Anthropic while Grok 3 Thinking is developed by xAI. Claude Opus 5 has a 1.0M 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 Opus 5 or Grok 3 Thinking?

It depends on your use case. Claude Opus 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 Opus 5 and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Claude Opus 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 Opus 5 and Grok 3 Thinking?

Claude Opus 5 is developed by Anthropic while Grok 3 Thinking is developed by xAI. Claude Opus 5 has a 1.0M 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 Opus 5 or Grok 3 Thinking?

It depends on your use case. Claude Opus 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 Opus 5 and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Claude Opus 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 Opus 5 vs Grok 3 Thinking: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 3 ThinkingRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window.

Too close to call

What do Claude Opus 5 and Grok 3 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Grok 3 Thinking

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

55%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Grok 3 Thinking

54%Vocabulary46%

21wSentence Length19w

0.40Hedging1.11

3.9Bold3.3

1.9Lists2.6

0.02Emoji0.00

0.71Headings0.64

0.05Transitions0.25

Based on 27 + 6 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 3 Thinking vs MiniMax M3New provider

Grok 3 Thinking vs Ox AlphaNew provider

Grok 3 Thinking vs Gemini 2.5 Pro Preview 06-05New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 3 ThinkingRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window.

Too close to call

What do Claude Opus 5 and Grok 3 Thinking say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Grok 3 Thinking

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

55%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Grok 3 Thinking

54%Vocabulary46%

21wSentence Length19w

0.40Hedging1.11

3.9Bold3.3

1.9Lists2.6

0.02Emoji0.00

0.71Headings0.64

0.05Transitions0.25

Based on 27 + 6 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 3 Thinking vs MiniMax M3New provider

Grok 3 Thinking vs Ox AlphaNew provider

Grok 3 Thinking vs Gemini 2.5 Pro Preview 06-05New provider