What is the difference between Gemini 3 Flash Preview and GPT-5.1 Codex Max?

Gemini 3 Flash Preview is developed by Google AI while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Flash Preview or GPT-5.1 Codex Max?

It depends on your use case. Gemini 3 Flash Preview and GPT-5.1 Codex Max 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 can I compare Gemini 3 Flash Preview and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Gemini 3 Flash Preview and GPT-5.1 Codex Max 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 Gemini 3 Flash Preview and GPT-5.1 Codex Max?

Gemini 3 Flash Preview is developed by Google AI while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Flash Preview or GPT-5.1 Codex Max?

It depends on your use case. Gemini 3 Flash Preview and GPT-5.1 Codex Max 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 can I compare Gemini 3 Flash Preview and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Gemini 3 Flash Preview and GPT-5.1 Codex Max 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.

Gemini 3 Flash Preview vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Gemini 3 Flash PreviewRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

Gemini 3 Flash Preview

Input

$0.50

Output

$3.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

55%

Gemini 3 Flash Preview uses 6.8x more headings

Gemini 3 Flash Preview

GPT-5.1 Codex Max

55%Vocabulary60%

18wSentence Length16w

0.42Hedging0.36

7.1Bold2.3

4.5Lists4.2

0.00Emoji0.00

0.84Headings0.12

0.07Transitions0.03

Based on 24 + 13 text responses

Research

What we learned reading every model

Gemini 3 Flash Preview and GPT-5.1 Codex Max 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

GPT-5.1 Codex Max vs MiniMax M3New provider

GPT-5.1 Codex Max vs Meta: Muse Spark 1.1New provider

GPT-5.1 Codex Max vs Thinking Machines: InklingNew provider

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

Gemini 3 Flash PreviewRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier.

Too close to call

API pricing

Cost per 1M tokens

Gemini 3 Flash Preview

Input

$0.50

Output

$3.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

55%

Gemini 3 Flash Preview uses 6.8x more headings

Gemini 3 Flash Preview

GPT-5.1 Codex Max

55%Vocabulary60%

18wSentence Length16w

0.42Hedging0.36

7.1Bold2.3

4.5Lists4.2

0.00Emoji0.00

0.84Headings0.12

0.07Transitions0.03

Based on 24 + 13 text responses

Research

What we learned reading every model

Gemini 3 Flash Preview and GPT-5.1 Codex Max 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

GPT-5.1 Codex Max vs MiniMax M3New provider

GPT-5.1 Codex Max vs Meta: Muse Spark 1.1New provider

GPT-5.1 Codex Max vs Thinking Machines: InklingNew provider