What is the difference between Claude Opus 4.8 and GPT-4o (Omni)?

Claude Opus 4.8 is developed by Anthropic while GPT-4o (Omni) is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or GPT-4o (Omni)?

It depends on your use case. Claude Opus 4.8 and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.8 cost compared to GPT-4o (Omni)?

Claude Opus 4.8 costs $5/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. GPT-4o (Omni) is $2.50/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-4o (Omni) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-4o (Omni) 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-4o (Omni)?

Claude Opus 4.8 is developed by Anthropic while GPT-4o (Omni) is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or GPT-4o (Omni)?

It depends on your use case. Claude Opus 4.8 and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.8 cost compared to GPT-4o (Omni)?

Claude Opus 4.8 costs $5/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. GPT-4o (Omni) is $2.50/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-4o (Omni) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-4o (Omni) 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-4o (Omni): Which Is Better?

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-4o (Omni)Runner-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-4o (Omni)

Input

$2.50

2.0× cheaper

Output

$10.00

2.5× cheaper

GPT-4o (Omni) is cheaper on both — 2.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

32%

Claude Opus 4.8 uses 30.9x more emoji

Claude Opus 4.8

GPT-4o (Omni)

60%Vocabulary54%

19wSentence Length18w

0.46Hedging0.72

4.7Bold7.3

3.2Lists5.6

0.78Emoji0.03

1.15Headings1.40

0.04Transitions0.26

Based on 27 + 24 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-4o (Omni) 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-4o (Omni) vs MiniMax M3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Claude Opus 4.8 vs GPT-5Cross-provider

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-4o (Omni)Runner-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-4o (Omni)

Input

$2.50

2.0× cheaper

Output

$10.00

2.5× cheaper

GPT-4o (Omni) is cheaper on both — 2.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

32%

Claude Opus 4.8 uses 30.9x more emoji

Claude Opus 4.8

GPT-4o (Omni)

60%Vocabulary54%

19wSentence Length18w

0.46Hedging0.72

4.7Bold7.3

3.2Lists5.6

0.78Emoji0.03

1.15Headings1.40

0.04Transitions0.26

Based on 27 + 24 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-4o (Omni) 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-4o (Omni) vs MiniMax M3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Claude Opus 4.8 vs GPT-5Cross-provider