What is the difference between Claude Opus 4.1 and OpenAI: GPT-5.6 Terra?

Claude Opus 4.1 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Opus 4.1 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 Opus 4.1 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Opus 4.1 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 Opus 4.1 cost compared to OpenAI: GPT-5.6 Terra?

Claude Opus 4.1 costs $15/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $12.50/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 Opus 4.1 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 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 Opus 4.1 and OpenAI: GPT-5.6 Terra?

Claude Opus 4.1 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Opus 4.1 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 Opus 4.1 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Opus 4.1 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 Opus 4.1 cost compared to OpenAI: GPT-5.6 Terra?

Claude Opus 4.1 costs $15/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $12.50/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 Opus 4.1 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 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 Opus 4.1 vs OpenAI: GPT-5.6 Terra: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 4.1

OpenAI: GPT-5.6 Terra

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

OpenAI: GPT-5.6 Terra is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

OpenAI: GPT-5.6 Terra

Input

$2.50

6.0× cheaper

Output

$15.00

5.0× cheaper

OpenAI: GPT-5.6 Terra is cheaper on both — 6.0× input, 5.0× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4.1 uses 38.4x more emoji

Claude Opus 4.1

OpenAI: GPT-5.6 Terra

61%Vocabulary57%

87wSentence Length18w

0.54Hedging0.85

5.1Bold2.8

6.7Lists4.6

0.38Emoji0.00

1.68Headings1.12

0.13Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.1 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

OpenAI: GPT-5.6 Terra vs MiniMax M3New provider

Claude Opus 4.1 vs GPT-5Cross-provider

OpenAI: GPT-5.6 Terra vs Llama 4 MaverickNew provider

Updated Jul 2026

Our Verdict

Claude Opus 4.1

OpenAI: GPT-5.6 Terra

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

OpenAI: GPT-5.6 Terra is 5.0x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

OpenAI: GPT-5.6 Terra

Input

$2.50

6.0× cheaper

Output

$15.00

5.0× cheaper

OpenAI: GPT-5.6 Terra is cheaper on both — 6.0× input, 5.0× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4.1 uses 38.4x more emoji

Claude Opus 4.1

OpenAI: GPT-5.6 Terra

61%Vocabulary57%

87wSentence Length18w

0.54Hedging0.85

5.1Bold2.8

6.7Lists4.6

0.38Emoji0.00

1.68Headings1.12

0.13Transitions0.06

Based on 17 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.1 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

OpenAI: GPT-5.6 Terra vs MiniMax M3New provider

Claude Opus 4.1 vs GPT-5Cross-provider

OpenAI: GPT-5.6 Terra vs Llama 4 MaverickNew provider