What is the difference between Claude Opus 4.8 and GPT-5?

Claude Opus 4.8 is developed by Anthropic while GPT-5 is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5's 400K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or GPT-5?

It depends on your use case. Claude Opus 4.8 and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.8 cost compared to GPT-5?

Claude Opus 4.8 costs $5/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $3.75/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 4.8 and GPT-5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-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 4.8 and GPT-5?

Claude Opus 4.8 is developed by Anthropic while GPT-5 is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5's 400K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or GPT-5?

It depends on your use case. Claude Opus 4.8 and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.8 cost compared to GPT-5?

Claude Opus 4.8 costs $5/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $3.75/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 4.8 and GPT-5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-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 4.8 vs GPT-5: Which Is Better?

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5Runner-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

GPT-5

Input

$1.25

4.0× cheaper

Output

$10.00

2.5× cheaper

GPT-5 is cheaper on both — 4.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

47%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

GPT-5

60%Vocabulary65%

19wSentence Length13w

0.46Hedging0.20

4.7Bold0.2

3.2Lists4.6

0.78Emoji0.00

1.15Headings0.16

0.04Transitions0.03

Based on 27 + 16 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5 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 Opus 4.8 vs MiniMax M3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Claude Opus 4.8 vs Gemini 2.5 Pro Preview 06-05New provider

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5Runner-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

GPT-5

Input

$1.25

4.0× cheaper

Output

$10.00

2.5× cheaper

GPT-5 is cheaper on both — 4.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

47%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

GPT-5

60%Vocabulary65%

19wSentence Length13w

0.46Hedging0.20

4.7Bold0.2

3.2Lists4.6

0.78Emoji0.00

1.15Headings0.16

0.04Transitions0.03

Based on 27 + 16 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5 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 Opus 4.8 vs MiniMax M3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Claude Opus 4.8 vs Gemini 2.5 Pro Preview 06-05New provider