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

Claude Opus 5 is developed by Anthropic while Grok 3 is developed by xAI. Claude Opus 5 has a 1.0M token context window vs Grok 3's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Grok 3?

It depends on your use case. Claude Opus 5 and Grok 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 5 and Grok 3 on Rival?

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

Claude Opus 5 is developed by Anthropic while Grok 3 is developed by xAI. Claude Opus 5 has a 1.0M token context window vs Grok 3's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Grok 3?

It depends on your use case. Claude Opus 5 and Grok 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 5 and Grok 3 on Rival?

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

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 3Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

57%

Grok 3 uses 2.3x more hedging

Claude Opus 5

Grok 3

54%Vocabulary49%

21wSentence Length18w

0.40Hedging0.94

3.9Bold2.5

1.9Lists3.0

0.02Emoji0.04

0.71Headings0.65

0.05Transitions0.08

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 5 and Grok 3 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

Grok 3 vs MiniMax M3New provider

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

Grok 3 vs GPT-5New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 3Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

57%

Grok 3 uses 2.3x more hedging

Claude Opus 5

Grok 3

54%Vocabulary49%

21wSentence Length18w

0.40Hedging0.94

3.9Bold2.5

1.9Lists3.0

0.02Emoji0.04

0.71Headings0.65

0.05Transitions0.08

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 5 and Grok 3 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

Grok 3 vs MiniMax M3New provider

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

Grok 3 vs GPT-5New provider