What is the difference between Claude Opus 4 and OpenAI: GPT-5.6 Sol?

Claude Opus 4 is developed by Anthropic while OpenAI: GPT-5.6 Sol is developed by OpenAI. Claude Opus 4 has a 200K token context window vs OpenAI: GPT-5.6 Sol'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 or OpenAI: GPT-5.6 Sol?

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

Claude Opus 4 costs $15/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. OpenAI: GPT-5.6 Sol is $10.00/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 and OpenAI: GPT-5.6 Sol on Rival?

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

Claude Opus 4 is developed by Anthropic while OpenAI: GPT-5.6 Sol is developed by OpenAI. Claude Opus 4 has a 200K token context window vs OpenAI: GPT-5.6 Sol'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 or OpenAI: GPT-5.6 Sol?

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

Claude Opus 4 costs $15/M input tokens and OpenAI: GPT-5.6 Sol costs $5/M input tokens. OpenAI: GPT-5.6 Sol is $10.00/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 and OpenAI: GPT-5.6 Sol on Rival?

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

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

Claude Opus 4Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

OpenAI: GPT-5.6 Sol

Input

$5.00

3.0× cheaper

Output

$30.00

2.5× cheaper

OpenAI: GPT-5.6 Sol is cheaper on both — 3.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

43%

Claude Opus 4 uses 4.0x more sentence length

Claude Opus 4

OpenAI: GPT-5.6 Sol

64%Vocabulary63%

62wSentence Length15w

0.52Hedging0.79

4.4Bold3.4

9.1Lists3.8

0.11Emoji0.03

1.87Headings0.95

0.27Transitions0.08

Based on 16 + 27 text responses

Research

What we learned reading every model

Claude Opus 4 and OpenAI: GPT-5.6 Sol 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 Opus 4 vs MiniMax M3New provider

Claude Opus 4 vs GPT-5Cross-provider

OpenAI: GPT-5.6 Sol vs Claude Opus 4.1Cross-provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Sol

Claude Opus 4Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

OpenAI: GPT-5.6 Sol

Input

$5.00

3.0× cheaper

Output

$30.00

2.5× cheaper

OpenAI: GPT-5.6 Sol is cheaper on both — 3.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

43%

Claude Opus 4 uses 4.0x more sentence length

Claude Opus 4

OpenAI: GPT-5.6 Sol

64%Vocabulary63%

62wSentence Length15w

0.52Hedging0.79

4.4Bold3.4

9.1Lists3.8

0.11Emoji0.03

1.87Headings0.95

0.27Transitions0.08

Based on 16 + 27 text responses

Research

What we learned reading every model

Claude Opus 4 and OpenAI: GPT-5.6 Sol 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 Opus 4 vs MiniMax M3New provider

Claude Opus 4 vs GPT-5Cross-provider

OpenAI: GPT-5.6 Sol vs Claude Opus 4.1Cross-provider