What is the difference between Claude Sonnet 5 and GPT-5.1 Chat?

Claude Sonnet 5 is developed by Anthropic while GPT-5.1 Chat is developed by OpenAI. Claude Sonnet 5 has a 1.0M token context window vs GPT-5.1 Chat's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 5 or GPT-5.1 Chat?

It depends on your use case. Claude Sonnet 5 and GPT-5.1 Chat each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 5 cost compared to GPT-5.1 Chat?

Claude Sonnet 5 costs $2/M input tokens and GPT-5.1 Chat costs $1.25/M input tokens. GPT-5.1 Chat is $0.75/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 Sonnet 5 and GPT-5.1 Chat on Rival?

This page shows a side-by-side comparison of Claude Sonnet 5 and GPT-5.1 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 Sonnet 5 and GPT-5.1 Chat?

Claude Sonnet 5 is developed by Anthropic while GPT-5.1 Chat is developed by OpenAI. Claude Sonnet 5 has a 1.0M token context window vs GPT-5.1 Chat's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 5 or GPT-5.1 Chat?

It depends on your use case. Claude Sonnet 5 and GPT-5.1 Chat each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 5 cost compared to GPT-5.1 Chat?

Claude Sonnet 5 costs $2/M input tokens and GPT-5.1 Chat costs $1.25/M input tokens. GPT-5.1 Chat is $0.75/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 Sonnet 5 and GPT-5.1 Chat on Rival?

This page shows a side-by-side comparison of Claude Sonnet 5 and GPT-5.1 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 Sonnet 5 vs GPT-5.1 Chat: Which Is Better?

Updated Jun 2026

Our Verdict

Claude Sonnet 5

GPT-5.1 ChatRunner-up

No community votes yet. On paper, Claude Sonnet 5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 5

Input

$2.00

Output

$10.00

GPT-5.1 Chat

Input

$1.25

1.6× cheaper

Output

$10.00

Writing DNA

Style Comparison

Similarity

66%

Claude Sonnet 5 uses 79.4x more emoji

Claude Sonnet 5

GPT-5.1 Chat

59%Vocabulary73%

35wSentence Length18w

0.53Hedging0.45

3.5Bold1.1

3.5Lists2.4

0.79Emoji0.00

1.25Headings0.00

0.06Transitions0.06

Based on 27 + 15 text responses

Research

What we learned reading every model

Claude Sonnet 5 and GPT-5.1 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-5.1 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Claude Sonnet 4Cross-provider

GPT-5.1 Chat vs Pony AlphaNew provider

Updated Jun 2026

Our Verdict

Claude Sonnet 5

GPT-5.1 ChatRunner-up

No community votes yet. On paper, Claude Sonnet 5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 5

Input

$2.00

Output

$10.00

GPT-5.1 Chat

Input

$1.25

1.6× cheaper

Output

$10.00

Writing DNA

Style Comparison

Similarity

66%

Claude Sonnet 5 uses 79.4x more emoji

Claude Sonnet 5

GPT-5.1 Chat

59%Vocabulary73%

35wSentence Length18w

0.53Hedging0.45

3.5Bold1.1

3.5Lists2.4

0.79Emoji0.00

1.25Headings0.00

0.06Transitions0.06

Based on 27 + 15 text responses

Research

What we learned reading every model

Claude Sonnet 5 and GPT-5.1 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-5.1 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Claude Sonnet 4Cross-provider

GPT-5.1 Chat vs Pony AlphaNew provider