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

Both are developed by Anthropic but target different use cases. Claude 3 Opus has a 200K token context window vs Claude Opus 4.8's 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or Claude Opus 4.8?

It depends on your use case. Claude 3 Opus and Claude Opus 4.8 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to Claude Opus 4.8?

Claude 3 Opus costs $15/M input tokens and Claude Opus 4.8 costs $5/M input tokens. Claude Opus 4.8 is $10.00/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 3 Opus and Claude Opus 4.8 on Rival?

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

Both are developed by Anthropic but target different use cases. Claude 3 Opus has a 200K token context window vs Claude Opus 4.8's 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or Claude Opus 4.8?

It depends on your use case. Claude 3 Opus and Claude Opus 4.8 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to Claude Opus 4.8?

Claude 3 Opus costs $15/M input tokens and Claude Opus 4.8 costs $5/M input tokens. Claude Opus 4.8 is $10.00/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 3 Opus and Claude Opus 4.8 on Rival?

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

Updated May 2026

Our Verdict

Claude Opus 4.8

Claude 3 OpusRunner-up

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

Claude Opus 4.8 is 3.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude 3 Opus

Input

$15.00

Output

$75.00

Claude Opus 4.8

Input

$5.00

3.0× cheaper

Output

$25.00

3.0× cheaper

Claude Opus 4.8 is cheaper on both — 3.0× input, 3.0× output

Writing DNA

Style Comparison

Similarity

64%

Claude Opus 4.8 uses 470.8x more bold

Claude 3 Opus

Claude Opus 4.8

54%Vocabulary60%

14wSentence Length19w

0.48Hedging0.46

0.0Bold4.7

3.0Lists3.2

0.00Emoji0.78

0.00Headings1.15

0.06Transitions0.04

Based on 3 + 27 text responses

Research

What we learned reading every model

Claude 3 Opus and Claude Opus 4.8 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

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Claude 3 Opus vs Llama 4 MaverickNew provider

Claude 3 Opus vs GPT-5New provider

Updated May 2026

Our Verdict

Claude Opus 4.8

Claude 3 OpusRunner-up

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

Claude Opus 4.8 is 3.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude 3 Opus

Input

$15.00

Output

$75.00

Claude Opus 4.8

Input

$5.00

3.0× cheaper

Output

$25.00

3.0× cheaper

Claude Opus 4.8 is cheaper on both — 3.0× input, 3.0× output

Writing DNA

Style Comparison

Similarity

64%

Claude Opus 4.8 uses 470.8x more bold

Claude 3 Opus

Claude Opus 4.8

54%Vocabulary60%

14wSentence Length19w

0.48Hedging0.46

0.0Bold4.7

3.0Lists3.2

0.00Emoji0.78

0.00Headings1.15

0.06Transitions0.04

Based on 3 + 27 text responses

Research

What we learned reading every model

Claude 3 Opus and Claude Opus 4.8 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 Opus vs MiniMax M3New provider

Claude 3 Opus vs Llama 4 MaverickNew provider

Claude 3 Opus vs GPT-5New provider