What is the difference between Claude Opus 4.8 and GPT-5.3 Chat?

Claude Opus 4.8 is developed by Anthropic while GPT-5.3 Chat is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5.3 Chat'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-5.3 Chat?

It depends on your use case. Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat?

Claude Opus 4.8 costs $5/M input tokens and GPT-5.3 Chat costs $1.75/M input tokens. GPT-5.3 Chat is $3.25/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-5.3 Chat on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat?

Claude Opus 4.8 is developed by Anthropic while GPT-5.3 Chat is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5.3 Chat'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-5.3 Chat?

It depends on your use case. Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat?

Claude Opus 4.8 costs $5/M input tokens and GPT-5.3 Chat costs $1.75/M input tokens. GPT-5.3 Chat is $3.25/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-5.3 Chat on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat: Which Is Better?

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5.3 ChatRunner-up

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

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

GPT-5.3 Chat

Input

$1.75

2.9× cheaper

Output

$14.00

1.8× cheaper

GPT-5.3 Chat is cheaper on both — 2.9× input, 1.8× output

Writing DNA

Style Comparison

Similarity

45%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

GPT-5.3 Chat

60%Vocabulary59%

19wSentence Length26w

0.46Hedging0.84

4.7Bold1.7

3.2Lists6.6

0.78Emoji0.00

1.15Headings0.00

0.04Transitions0.25

Based on 27 + 23 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat vs MiniMax M3New provider

Claude Opus 4.8 vs Grok 3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Updated May 2026

Our Verdict

Claude Opus 4.8

GPT-5.3 ChatRunner-up

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

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

GPT-5.3 Chat

Input

$1.75

2.9× cheaper

Output

$14.00

1.8× cheaper

GPT-5.3 Chat is cheaper on both — 2.9× input, 1.8× output

Writing DNA

Style Comparison

Similarity

45%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

GPT-5.3 Chat

60%Vocabulary59%

19wSentence Length26w

0.46Hedging0.84

4.7Bold1.7

3.2Lists6.6

0.78Emoji0.00

1.15Headings0.00

0.04Transitions0.25

Based on 27 + 23 text responses

Research

What we learned reading every model

Claude Opus 4.8 and GPT-5.3 Chat 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-5.3 Chat vs MiniMax M3New provider

Claude Opus 4.8 vs Grok 3New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider