What is the difference between Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna?

Google: Gemma 4 31B is developed by Google AI while OpenAI: GPT-5.6 Luna is developed by OpenAI. Google: Gemma 4 31B has a 262K token context window vs OpenAI: GPT-5.6 Luna's 1.1M. You can compare their actual outputs across 45 challenges on Rival to see how they differ in practice.

Which is better, Google: Gemma 4 31B or OpenAI: GPT-5.6 Luna?

It depends on your use case. Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 45 challenges so you can judge which fits your needs best.

How much does Google: Gemma 4 31B cost compared to OpenAI: GPT-5.6 Luna?

Google: Gemma 4 31B costs $0.14/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. Google: Gemma 4 31B is $0.86/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 Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Google: Gemma 4 31B 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 Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna?

Google: Gemma 4 31B is developed by Google AI while OpenAI: GPT-5.6 Luna is developed by OpenAI. Google: Gemma 4 31B has a 262K token context window vs OpenAI: GPT-5.6 Luna's 1.1M. You can compare their actual outputs across 45 challenges on Rival to see how they differ in practice.

Which is better, Google: Gemma 4 31B or OpenAI: GPT-5.6 Luna?

It depends on your use case. Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 45 challenges so you can judge which fits your needs best.

How much does Google: Gemma 4 31B cost compared to OpenAI: GPT-5.6 Luna?

Google: Gemma 4 31B costs $0.14/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. Google: Gemma 4 31B is $0.86/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 Google: Gemma 4 31B and OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Google: Gemma 4 31B 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.

Google: Gemma 4 31B vs OpenAI: GPT-5.6 Luna: Which Is Better?

Updated Jul 2026

Our Verdict

Google: Gemma 4 31B

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.

Google: Gemma 4 31B is 15x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Google: Gemma 4 31B

Input

$0.14

7.1× cheaper

Output

$0.40

15× cheaper

OpenAI: GPT-5.6 Luna

Input

$1.00

Output

$6.00

Google: Gemma 4 31B is cheaper on both — 7.1× input, 15× output

Writing DNA

Style Comparison

Similarity

33%

Google: Gemma 4 31B uses 23.8x more emoji

Google: Gemma 4 31B

OpenAI: GPT-5.6 Luna

57%Vocabulary59%

18wSentence Length19w

0.37Hedging0.84

7.1Bold2.7

4.0Lists4.5

0.24Emoji0.00

0.94Headings1.20

0.16Transitions0.10

Based on 23 + 27 text responses

Research

What we learned reading every model

Google: Gemma 4 31B 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

Google: Gemma 4 31B vs MiniMax M3New provider

Google: Gemma 4 31B vs GPT-5Cross-provider

Google: Gemma 4 31B vs Claude Opus 4New provider

Updated Jul 2026

Our Verdict

Google: Gemma 4 31B

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.

Google: Gemma 4 31B is 15x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Google: Gemma 4 31B

Input

$0.14

7.1× cheaper

Output

$0.40

15× cheaper

OpenAI: GPT-5.6 Luna

Input

$1.00

Output

$6.00

Google: Gemma 4 31B is cheaper on both — 7.1× input, 15× output

Writing DNA

Style Comparison

Similarity

33%

Google: Gemma 4 31B uses 23.8x more emoji

Google: Gemma 4 31B

OpenAI: GPT-5.6 Luna

57%Vocabulary59%

18wSentence Length19w

0.37Hedging0.84

7.1Bold2.7

4.0Lists4.5

0.24Emoji0.00

0.94Headings1.20

0.16Transitions0.10

Based on 23 + 27 text responses

Research

What we learned reading every model

Google: Gemma 4 31B 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

Google: Gemma 4 31B vs MiniMax M3New provider

Google: Gemma 4 31B vs GPT-5Cross-provider

Google: Gemma 4 31B vs Claude Opus 4New provider