What is the difference between Gemma 3 12B and GPT-5 Codex?

Gemma 3 12B is developed by Google AI while GPT-5 Codex is developed by OpenAI. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

Which is better, Gemma 3 12B or GPT-5 Codex?

It depends on your use case. Gemma 3 12B and GPT-5 Codex each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

How can I compare Gemma 3 12B and GPT-5 Codex on Rival?

This page shows a side-by-side comparison of Gemma 3 12B and GPT-5 Codex 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 3 12B and GPT-5 Codex?

Gemma 3 12B is developed by Google AI while GPT-5 Codex is developed by OpenAI. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

Which is better, Gemma 3 12B or GPT-5 Codex?

It depends on your use case. Gemma 3 12B and GPT-5 Codex each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

How can I compare Gemma 3 12B and GPT-5 Codex on Rival?

This page shows a side-by-side comparison of Gemma 3 12B and GPT-5 Codex 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 3 12B vs GPT-5 Codex: Which Is Better?

Updated Sep 2025

Our Verdict

GPT-5 Codex

Gemma 3 12BRunner-up

No community votes yet. On paper, GPT-5 Codex has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Gemma 3 12B

Input

$0.03

Output

$0.03

GPT-5 Codex

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

26%

GPT-5 Codex uses 14.6x more emoji

Gemma 3 12B

GPT-5 Codex

52%Vocabulary64%

17wSentence Length17w

0.66Hedging0.38

6.2Bold2.3

5.4Lists3.5

0.00Emoji0.15

0.06Headings0.49

0.23Transitions0.05

Based on 23 + 13 text responses

Research

What we learned reading every model

Gemma 3 12B and GPT-5 Codex 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

Gemma 3 12B vs MiniMax M3New provider

Gemma 3 12B vs Grok 3New provider

Gemma 3 12B vs Llama 4 MaverickNew provider

Updated Sep 2025

Our Verdict

GPT-5 Codex

Gemma 3 12BRunner-up

No community votes yet. On paper, GPT-5 Codex has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Gemma 3 12B

Input

$0.03

Output

$0.03

GPT-5 Codex

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

26%

GPT-5 Codex uses 14.6x more emoji

Gemma 3 12B

GPT-5 Codex

52%Vocabulary64%

17wSentence Length17w

0.66Hedging0.38

6.2Bold2.3

5.4Lists3.5

0.00Emoji0.15

0.06Headings0.49

0.23Transitions0.05

Based on 23 + 13 text responses

Research

What we learned reading every model

Gemma 3 12B and GPT-5 Codex 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

Gemma 3 12B vs MiniMax M3New provider

Gemma 3 12B vs Grok 3New provider

Gemma 3 12B vs Llama 4 MaverickNew provider