What is the difference between Claude 3.7 Sonnet and GPT-5.3-Codex?

Claude 3.7 Sonnet is developed by Anthropic while GPT-5.3-Codex is developed by OpenAI. Claude 3.7 Sonnet has a 200K token context window vs GPT-5.3-Codex's 400K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Sonnet or GPT-5.3-Codex?

It depends on your use case. Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet cost compared to GPT-5.3-Codex?

Claude 3.7 Sonnet costs $3/M input tokens and GPT-5.3-Codex costs $1.75/M input tokens. GPT-5.3-Codex is $1.25/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 3.7 Sonnet and GPT-5.3-Codex on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet and GPT-5.3-Codex?

Claude 3.7 Sonnet is developed by Anthropic while GPT-5.3-Codex is developed by OpenAI. Claude 3.7 Sonnet has a 200K token context window vs GPT-5.3-Codex's 400K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude 3.7 Sonnet or GPT-5.3-Codex?

It depends on your use case. Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet cost compared to GPT-5.3-Codex?

Claude 3.7 Sonnet costs $3/M input tokens and GPT-5.3-Codex costs $1.75/M input tokens. GPT-5.3-Codex is $1.25/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 3.7 Sonnet and GPT-5.3-Codex on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet vs GPT-5.3-Codex: Which Is Better?

Updated Feb 2026

Our Verdict

GPT-5.3-Codex

Claude 3.7 SonnetRunner-up

No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

GPT-5.3-Codex

Input

$1.75

1.7× cheaper

Output

$14.00

1.1× cheaper

GPT-5.3-Codex is cheaper on both — 1.7× input, 1.1× output

Writing DNA

Style Comparison

Similarity

50%

GPT-5.3-Codex uses 15.8x more emoji

Claude 3.7 Sonnet

GPT-5.3-Codex

62%Vocabulary65%

35wSentence Length23w

0.99Hedging0.51

1.2Bold6.5

4.3Lists6.2

0.00Emoji0.16

1.78Headings1.90

0.23Transitions0.03

Based on 13 + 23 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Sonnet vs Gemini 2.5 Pro Preview 06-05New provider

Updated Feb 2026

Our Verdict

GPT-5.3-Codex

Claude 3.7 SonnetRunner-up

No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

GPT-5.3-Codex

Input

$1.75

1.7× cheaper

Output

$14.00

1.1× cheaper

GPT-5.3-Codex is cheaper on both — 1.7× input, 1.1× output

Writing DNA

Style Comparison

Similarity

50%

GPT-5.3-Codex uses 15.8x more emoji

Claude 3.7 Sonnet

GPT-5.3-Codex

62%Vocabulary65%

35wSentence Length23w

0.99Hedging0.51

1.2Bold6.5

4.3Lists6.2

0.00Emoji0.16

1.78Headings1.90

0.23Transitions0.03

Based on 13 + 23 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet and GPT-5.3-Codex 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 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider

Claude 3.7 Sonnet vs Gemini 2.5 Pro Preview 06-05New provider