What is the difference between Claude Opus 4 and GPT-5.3 Chat?

Claude Opus 4 is developed by Anthropic while GPT-5.3 Chat is developed by OpenAI. Claude Opus 4 has a 200K 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 or GPT-5.3 Chat?

It depends on your use case. Claude Opus 4 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 cost compared to GPT-5.3 Chat?

Claude Opus 4 costs $15/M input tokens and GPT-5.3 Chat costs $1.75/M input tokens. GPT-5.3 Chat is $13.25/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 and GPT-5.3 Chat on Rival?

This page shows a side-by-side comparison of Claude Opus 4 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 and GPT-5.3 Chat?

Claude Opus 4 is developed by Anthropic while GPT-5.3 Chat is developed by OpenAI. Claude Opus 4 has a 200K 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 or GPT-5.3 Chat?

It depends on your use case. Claude Opus 4 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 cost compared to GPT-5.3 Chat?

Claude Opus 4 costs $15/M input tokens and GPT-5.3 Chat costs $1.75/M input tokens. GPT-5.3 Chat is $13.25/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 and GPT-5.3 Chat on Rival?

This page shows a side-by-side comparison of Claude Opus 4 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 vs GPT-5.3 Chat: Which Is Better?

Updated Mar 2026

Our Verdict

Claude Opus 4

GPT-5.3 ChatRunner-up

No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, bigger context window.

GPT-5.3 Chat is 5.4x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

GPT-5.3 Chat

Input

$1.75

8.6× cheaper

Output

$14.00

5.4× cheaper

GPT-5.3 Chat is cheaper on both — 8.6× input, 5.4× output

Writing DNA

Style Comparison

Similarity

46%

Claude Opus 4 uses 11.2x more emoji

Claude Opus 4

GPT-5.3 Chat

64%Vocabulary59%

62wSentence Length26w

0.52Hedging0.84

4.4Bold1.7

9.1Lists6.6

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.25

Based on 16 + 23 text responses

Research

What we learned reading every model

Claude Opus 4 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

GPT-5.3 Chat vs Claude Sonnet 4Cross-provider

GPT-5.3 Chat vs Gemini 2.5 Pro Preview 06-05New provider

Updated Mar 2026

Our Verdict

Claude Opus 4

GPT-5.3 ChatRunner-up

No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, bigger context window.

GPT-5.3 Chat is 5.4x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

GPT-5.3 Chat

Input

$1.75

8.6× cheaper

Output

$14.00

5.4× cheaper

GPT-5.3 Chat is cheaper on both — 8.6× input, 5.4× output

Writing DNA

Style Comparison

Similarity

46%

Claude Opus 4 uses 11.2x more emoji

Claude Opus 4

GPT-5.3 Chat

64%Vocabulary59%

62wSentence Length26w

0.52Hedging0.84

4.4Bold1.7

9.1Lists6.6

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.25

Based on 16 + 23 text responses

Research

What we learned reading every model

Claude Opus 4 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

GPT-5.3 Chat vs Claude Sonnet 4Cross-provider

GPT-5.3 Chat vs Gemini 2.5 Pro Preview 06-05New provider