What is the difference between Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna?

Claude 3.7 Sonnet is developed by Anthropic while OpenAI: GPT-5.6 Luna is developed by OpenAI. Claude 3.7 Sonnet has a 200K token context window vs OpenAI: GPT-5.6 Luna'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 3.7 Sonnet or OpenAI: GPT-5.6 Luna?

It depends on your use case. Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet cost compared to OpenAI: GPT-5.6 Luna?

Claude 3.7 Sonnet costs $3/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. OpenAI: GPT-5.6 Luna is $2.00/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 3.7 Sonnet and OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet and OpenAI: GPT-5.6 Luna?

Claude 3.7 Sonnet is developed by Anthropic while OpenAI: GPT-5.6 Luna is developed by OpenAI. Claude 3.7 Sonnet has a 200K token context window vs OpenAI: GPT-5.6 Luna'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 3.7 Sonnet or OpenAI: GPT-5.6 Luna?

It depends on your use case. Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet cost compared to OpenAI: GPT-5.6 Luna?

Claude 3.7 Sonnet costs $3/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. OpenAI: GPT-5.6 Luna is $2.00/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 3.7 Sonnet and OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet vs OpenAI: GPT-5.6 Luna: Which Is Better?

Updated Jul 2026

Our Verdict

Claude 3.7 Sonnet

OpenAI: GPT-5.6 Luna

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

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

OpenAI: GPT-5.6 Luna

Input

$1.00

3.0× cheaper

Output

$6.00

2.5× cheaper

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

Writing DNA

Style Comparison

Similarity

80%

Claude 3.7 Sonnet uses 2.3x more transitions

Claude 3.7 Sonnet

OpenAI: GPT-5.6 Luna

62%Vocabulary59%

35wSentence Length19w

0.99Hedging0.84

1.2Bold2.7

4.3Lists4.5

0.00Emoji0.00

1.78Headings1.20

0.23Transitions0.10

Based on 13 + 27 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs GPT-5Cross-provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider

Updated Jul 2026

Our Verdict

Claude 3.7 Sonnet

OpenAI: GPT-5.6 Luna

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

Too close to call

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet

Input

$3.00

Output

$15.00

OpenAI: GPT-5.6 Luna

Input

$1.00

3.0× cheaper

Output

$6.00

2.5× cheaper

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

Writing DNA

Style Comparison

Similarity

80%

Claude 3.7 Sonnet uses 2.3x more transitions

Claude 3.7 Sonnet

OpenAI: GPT-5.6 Luna

62%Vocabulary59%

35wSentence Length19w

0.99Hedging0.84

1.2Bold2.7

4.3Lists4.5

0.00Emoji0.00

1.78Headings1.20

0.23Transitions0.10

Based on 13 + 27 text responses

Research

What we learned reading every model

Claude 3.7 Sonnet and OpenAI: GPT-5.6 Luna 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 3.7 Sonnet vs MiniMax M3New provider

Claude 3.7 Sonnet vs GPT-5Cross-provider

Claude 3.7 Sonnet vs Llama 4 MaverickNew provider