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

Claude Opus 4.8 is developed by Anthropic while GPT-5 Pro is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

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

It depends on your use case. Claude Opus 4.8 and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

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

Claude Opus 4.8 costs $5/M input tokens and GPT-5 Pro costs $15/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 Opus 4.8 and GPT-5 Pro on Rival?

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

Claude Opus 4.8 is developed by Anthropic while GPT-5 Pro is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

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

It depends on your use case. Claude Opus 4.8 and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

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

Claude Opus 4.8 costs $5/M input tokens and GPT-5 Pro costs $15/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 Opus 4.8 and GPT-5 Pro on Rival?

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

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5 ProRunner-up

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

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

3.0× cheaper

Output

$25.00

4.8× cheaper

GPT-5 Pro

Input

$15.00

Output

$120.00

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

Writing DNA

Style Comparison

Similarity

43%

Claude Opus 4.8 uses 470.8x more bold

Claude Opus 4.8

GPT-5 Pro

60%Vocabulary65%

19wSentence Length15w

0.46Hedging0.32

4.7Bold0.0

3.2Lists2.9

0.78Emoji0.00

1.15Headings0.00

0.04Transitions0.01

Based on 27 + 11 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5 Pro 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

GPT-5 Pro vs MiniMax M3New provider

GPT-5 Pro vs Grok 3New provider

GPT-5 Pro vs Llama 4 MaverickNew provider

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5 ProRunner-up

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

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

3.0× cheaper

Output

$25.00

4.8× cheaper

GPT-5 Pro

Input

$15.00

Output

$120.00

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

Writing DNA

Style Comparison

Similarity

43%

Claude Opus 4.8 uses 470.8x more bold

Claude Opus 4.8

GPT-5 Pro

60%Vocabulary65%

19wSentence Length15w

0.46Hedging0.32

4.7Bold0.0

3.2Lists2.9

0.78Emoji0.00

1.15Headings0.00

0.04Transitions0.01

Based on 27 + 11 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5 Pro 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

GPT-5 Pro vs MiniMax M3New provider

GPT-5 Pro vs Grok 3New provider

GPT-5 Pro vs Llama 4 MaverickNew provider