What is the difference between Gemma 4 31B and GPT-5.6 Luna Pro?

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

Which is better, Gemma 4 31B or GPT-5.6 Luna Pro?

It depends on your use case. Gemma 4 31B and GPT-5.6 Luna Pro 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 Gemma 4 31B cost compared to GPT-5.6 Luna Pro?

Gemma 4 31B costs $0.14/M input tokens and GPT-5.6 Luna Pro costs $1/M input tokens. 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 Gemma 4 31B and GPT-5.6 Luna Pro on Rival?

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

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

Which is better, Gemma 4 31B or GPT-5.6 Luna Pro?

It depends on your use case. Gemma 4 31B and GPT-5.6 Luna Pro 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 Gemma 4 31B cost compared to GPT-5.6 Luna Pro?

Gemma 4 31B costs $0.14/M input tokens and GPT-5.6 Luna Pro costs $1/M input tokens. 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 Gemma 4 31B and GPT-5.6 Luna Pro on Rival?

This page shows a side-by-side comparison of Gemma 4 31B and GPT-5.6 Luna Pro 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.

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

Updated Jul 2026

Our Verdict

Gemma 4 31B

GPT-5.6 Luna Pro

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

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

Too close to call

What do Gemma 4 31B and GPT-5.6 Luna Pro say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Gemma 4 31B

Input

$0.14

7.1× cheaper

Output

$0.40

15× cheaper

GPT-5.6 Luna Pro

Input

$1.00

Output

$6.00

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

Writing DNA

Style Comparison

Similarity

39%

Gemma 4 31B uses 2.5x more bold

Gemma 4 31B

GPT-5.6 Luna Pro

57%Vocabulary58%

18wSentence Length18w

0.37Hedging0.81

7.1Bold2.9

4.0Lists5.1

0.24Emoji0.54

0.94Headings1.10

0.16Transitions0.09

Based on 23 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Gemma 4 31B vs Ox AlphaNew provider

Gemma 4 31B vs MiniMax M3New provider

Gemma 4 31B vs GPT-5Cross-provider

Updated Jul 2026

Our Verdict

Gemma 4 31B

GPT-5.6 Luna Pro

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

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

Too close to call

What do Gemma 4 31B and GPT-5.6 Luna Pro say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Gemma 4 31B

Input

$0.14

7.1× cheaper

Output

$0.40

15× cheaper

GPT-5.6 Luna Pro

Input

$1.00

Output

$6.00

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

Writing DNA

Style Comparison

Similarity

39%

Gemma 4 31B uses 2.5x more bold

Gemma 4 31B

GPT-5.6 Luna Pro

57%Vocabulary58%

18wSentence Length18w

0.37Hedging0.81

7.1Bold2.9

4.0Lists5.1

0.24Emoji0.54

0.94Headings1.10

0.16Transitions0.09

Based on 23 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Gemma 4 31B vs Ox AlphaNew provider

Gemma 4 31B vs MiniMax M3New provider

Gemma 4 31B vs GPT-5Cross-provider