What is the difference between OpenAI: GPT-5.6 Luna and o1?

Both are developed by OpenAI but target different use cases. OpenAI: GPT-5.6 Luna has a 1.1M token context window vs o1's 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Luna or o1?

It depends on your use case. OpenAI: GPT-5.6 Luna and o1 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 OpenAI: GPT-5.6 Luna cost compared to o1?

OpenAI: GPT-5.6 Luna costs $1/M input tokens and o1 costs $15/M input tokens. OpenAI: GPT-5.6 Luna is $14.00/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 OpenAI: GPT-5.6 Luna and o1 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Luna and o1 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 OpenAI: GPT-5.6 Luna and o1?

Both are developed by OpenAI but target different use cases. OpenAI: GPT-5.6 Luna has a 1.1M token context window vs o1's 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, OpenAI: GPT-5.6 Luna or o1?

It depends on your use case. OpenAI: GPT-5.6 Luna and o1 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 OpenAI: GPT-5.6 Luna cost compared to o1?

OpenAI: GPT-5.6 Luna costs $1/M input tokens and o1 costs $15/M input tokens. OpenAI: GPT-5.6 Luna is $14.00/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 OpenAI: GPT-5.6 Luna and o1 on Rival?

This page shows a side-by-side comparison of OpenAI: GPT-5.6 Luna and o1 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.

OpenAI: GPT-5.6 Luna vs o1: Which Is Better?

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Luna

o1Runner-up

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

OpenAI: GPT-5.6 Luna is 10x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Luna

Input

$1.00

15× cheaper

Output

$6.00

10× cheaper

Input

$15.00

Output

$60.00

OpenAI: GPT-5.6 Luna is cheaper on both — 15× input, 10× output

Writing DNA

Style Comparison

Similarity

72%

o1 uses 4.0x more transitions

OpenAI: GPT-5.6 Luna

59%Vocabulary64%

19wSentence Length16w

0.84Hedging0.76

2.7Bold5.0

4.5Lists2.6

0.00Emoji0.00

1.20Headings0.44

0.10Transitions0.40

Based on 27 + 13 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Luna and o1 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

o1 vs MiniMax M3New provider

o1 vs Claude Opus 4New provider

o1 vs Gemini 2.5 Pro Preview 06-05New provider

Updated Jul 2026

Our Verdict

OpenAI: GPT-5.6 Luna

o1Runner-up

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

OpenAI: GPT-5.6 Luna is 10x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

OpenAI: GPT-5.6 Luna

Input

$1.00

15× cheaper

Output

$6.00

10× cheaper

Input

$15.00

Output

$60.00

OpenAI: GPT-5.6 Luna is cheaper on both — 15× input, 10× output

Writing DNA

Style Comparison

Similarity

72%

o1 uses 4.0x more transitions

OpenAI: GPT-5.6 Luna

59%Vocabulary64%

19wSentence Length16w

0.84Hedging0.76

2.7Bold5.0

4.5Lists2.6

0.00Emoji0.00

1.20Headings0.44

0.10Transitions0.40

Based on 27 + 13 text responses

Research

What we learned reading every model

OpenAI: GPT-5.6 Luna and o1 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

o1 vs MiniMax M3New provider

o1 vs Claude Opus 4New provider

o1 vs Gemini 2.5 Pro Preview 06-05New provider