What is the difference between Claude Opus 5 and Grok 4.5?

Claude Opus 5 is developed by Anthropic while Grok 4.5 is developed by xAI. Claude Opus 5 has a 1.0M token context window vs Grok 4.5's 500K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Grok 4.5?

It depends on your use case. Claude Opus 5 and Grok 4.5 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 much does Claude Opus 5 cost compared to Grok 4.5?

Claude Opus 5 costs $5/M input tokens and Grok 4.5 costs $2/M input tokens. Grok 4.5 is $3.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Opus 5 and Grok 4.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Grok 4.5 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 4.5?

Claude Opus 5 is developed by Anthropic while Grok 4.5 is developed by xAI. Claude Opus 5 has a 1.0M token context window vs Grok 4.5's 500K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Grok 4.5?

It depends on your use case. Claude Opus 5 and Grok 4.5 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 much does Claude Opus 5 cost compared to Grok 4.5?

Claude Opus 5 costs $5/M input tokens and Grok 4.5 costs $2/M input tokens. Grok 4.5 is $3.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Opus 5 and Grok 4.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Grok 4.5 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 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 4.5Runner-up

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

Grok 4.5 is 4.2x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and Grok 4.5 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 4.5

Input

$2.00

2.5× cheaper

Output

$6.00

4.2× cheaper

Grok 4.5 is cheaper on both — 2.5× input, 4.2× output

Writing DNA

Style Comparison

Similarity

60%

Grok 4.5 uses 5.3x more emoji

Claude Opus 5

Grok 4.5

54%Vocabulary61%

21wSentence Length16w

0.40Hedging0.23

3.9Bold2.5

1.9Lists2.4

0.02Emoji0.09

0.71Headings0.48

0.05Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs Gemini 2.5 Pro Preview 06-05New provider

Updated Jul 2026

Our Verdict

Claude Opus 5

Grok 4.5Runner-up

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

Grok 4.5 is 4.2x cheaper per token — worth considering if cost matters.

Too close to call

What do Claude Opus 5 and Grok 4.5 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 4.5

Input

$2.00

2.5× cheaper

Output

$6.00

4.2× cheaper

Grok 4.5 is cheaper on both — 2.5× input, 4.2× output

Writing DNA

Style Comparison

Similarity

60%

Grok 4.5 uses 5.3x more emoji

Claude Opus 5

Grok 4.5

54%Vocabulary61%

21wSentence Length16w

0.40Hedging0.23

3.9Bold2.5

1.9Lists2.4

0.02Emoji0.09

0.71Headings0.48

0.05Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs Gemini 2.5 Pro Preview 06-05New provider