What is the difference between Claude Opus 5 and OpenAI: GPT-5.6 Terra?

Claude Opus 5 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Opus 5 has a 1.0M token context window vs OpenAI: GPT-5.6 Terra's 1.1M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Opus 5 and OpenAI: GPT-5.6 Terra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Opus 5 cost compared to OpenAI: GPT-5.6 Terra?

Claude Opus 5 costs $5/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $2.50/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 5 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Opus 5 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 5 and OpenAI: GPT-5.6 Terra?

Claude Opus 5 is developed by Anthropic while OpenAI: GPT-5.6 Terra is developed by OpenAI. Claude Opus 5 has a 1.0M token context window vs OpenAI: GPT-5.6 Terra's 1.1M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or OpenAI: GPT-5.6 Terra?

It depends on your use case. Claude Opus 5 and OpenAI: GPT-5.6 Terra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Opus 5 cost compared to OpenAI: GPT-5.6 Terra?

Claude Opus 5 costs $5/M input tokens and OpenAI: GPT-5.6 Terra costs $2.5/M input tokens. OpenAI: GPT-5.6 Terra is $2.50/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 5 and OpenAI: GPT-5.6 Terra on Rival?

This page shows a side-by-side comparison of Claude Opus 5 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 5 vs OpenAI: GPT-5.6 Terra: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

OpenAI: GPT-5.6 TerraRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

OpenAI: GPT-5.6 Terra

Input

$2.50

2.0× cheaper

Output

$15.00

1.7× cheaper

OpenAI: GPT-5.6 Terra is cheaper on both — 2.0× input, 1.7× output

Writing DNA

Style Comparison

Similarity

49%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

OpenAI: GPT-5.6 Terra

54%Vocabulary57%

21wSentence Length18w

0.40Hedging0.85

3.9Bold2.8

1.9Lists4.6

0.02Emoji0.00

0.71Headings1.12

0.05Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 5 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 5 vs Gemini 2.5 Pro Preview 06-05New provider

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

Updated Jul 2026

Our Verdict

Claude Opus 5

OpenAI: GPT-5.6 TerraRunner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

OpenAI: GPT-5.6 Terra

Input

$2.50

2.0× cheaper

Output

$15.00

1.7× cheaper

OpenAI: GPT-5.6 Terra is cheaper on both — 2.0× input, 1.7× output

Writing DNA

Style Comparison

Similarity

49%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

OpenAI: GPT-5.6 Terra

54%Vocabulary57%

21wSentence Length18w

0.40Hedging0.85

3.9Bold2.8

1.9Lists4.6

0.02Emoji0.00

0.71Headings1.12

0.05Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 5 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 5 vs Gemini 2.5 Pro Preview 06-05New provider

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