What is the difference between Claude Sonnet 4 and OpenAI: GPT-5.6 Terra?

Claude Sonnet 4 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Sonnet 4 has a 200K token context window vs OpenAI: GPT-5.6 Terra's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 Sonnet 4 cost compared to OpenAI: GPT-5.6 Terra?

Claude Sonnet 4 costs $3/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $0.50/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 Sonnet 4 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 4 and OpenAI: GPT-5.6 Terra?

Claude Sonnet 4 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Sonnet 4 has a 200K token context window vs OpenAI: GPT-5.6 Terra's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 Sonnet 4 cost compared to OpenAI: GPT-5.6 Terra?

Claude Sonnet 4 costs $3/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $0.50/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 Sonnet 4 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 4 vs OpenAI: GPT-5.6 Terra: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Terra

Claude Sonnet 4Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4

Input

$3.00

Output

$15.00

OpenAI: GPT-5.6 Terra

Input

$2.50

1.2× cheaper

Output

$15.00

Writing DNA

Style Comparison

Similarity

47%

Claude Sonnet 4 uses 87.9x more emoji

Claude Sonnet 4

OpenAI: GPT-5.6 Terra

62%Vocabulary57%

111wSentence Length18w

0.40Hedging0.85

5.0Bold2.8

9.3Lists4.6

0.88Emoji0.00

2.16Headings1.12

0.33Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 Sonnet 4 vs MiniMax M3New provider

OpenAI: GPT-5.6 Terra vs Claude Opus 4Cross-provider

Claude Sonnet 4 vs GPT-5Cross-provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Terra

Claude Sonnet 4Runner-up

No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Sonnet 4

Input

$3.00

Output

$15.00

OpenAI: GPT-5.6 Terra

Input

$2.50

1.2× cheaper

Output

$15.00

Writing DNA

Style Comparison

Similarity

47%

Claude Sonnet 4 uses 87.9x more emoji

Claude Sonnet 4

OpenAI: GPT-5.6 Terra

62%Vocabulary57%

111wSentence Length18w

0.40Hedging0.85

5.0Bold2.8

9.3Lists4.6

0.88Emoji0.00

2.16Headings1.12

0.33Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Sonnet 4 and OpenAI: GPT-5.6 Terra 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 Sonnet 4 vs MiniMax M3New provider

OpenAI: GPT-5.6 Terra vs Claude Opus 4Cross-provider

Claude Sonnet 4 vs GPT-5Cross-provider