What is the difference between Claude Opus 4.8 and Grok 3?

Claude Opus 4.8 is developed by Anthropic while Grok 3 is developed by xAI. Claude Opus 4.8 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 4.8 or Grok 3?

It depends on your use case. Claude Opus 4.8 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 4.8 and Grok 3 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 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 4.8 and Grok 3?

Claude Opus 4.8 is developed by Anthropic while Grok 3 is developed by xAI. Claude Opus 4.8 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 4.8 or Grok 3?

It depends on your use case. Claude Opus 4.8 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 4.8 and Grok 3 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 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 4.8 vs Grok 3: Which Is Better?

Updated May 2026

Our Verdict

Claude Opus 4.8

Grok 3Runner-up

No community votes yet. On paper, Claude Opus 4.8 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

29%

Claude Opus 4.8 uses 19.7x more emoji

Claude Opus 4.8

Grok 3

60%Vocabulary49%

19wSentence Length18w

0.46Hedging0.94

4.7Bold2.5

3.2Lists3.0

0.78Emoji0.04

1.15Headings0.65

0.04Transitions0.08

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 4.8 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

Claude Opus 4.8 vs OpenAI o3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Updated May 2026

Our Verdict

Claude Opus 4.8

Grok 3Runner-up

No community votes yet. On paper, Claude Opus 4.8 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

29%

Claude Opus 4.8 uses 19.7x more emoji

Claude Opus 4.8

Grok 3

60%Vocabulary49%

19wSentence Length18w

0.46Hedging0.94

4.7Bold2.5

3.2Lists3.0

0.78Emoji0.04

1.15Headings0.65

0.04Transitions0.08

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 4.8 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

Claude Opus 4.8 vs OpenAI o3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider