What is the difference between Gemini 3.1 Pro Preview and GPT-5.1 Codex Max?

Gemini 3.1 Pro Preview is developed by Google AI while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.1 Pro Preview or GPT-5.1 Codex Max?

It depends on your use case. Gemini 3.1 Pro Preview and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare Gemini 3.1 Pro Preview and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Gemini 3.1 Pro 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 3.1 Pro Preview and GPT-5.1 Codex Max?

Gemini 3.1 Pro Preview is developed by Google AI while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.1 Pro Preview or GPT-5.1 Codex Max?

It depends on your use case. Gemini 3.1 Pro Preview and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare Gemini 3.1 Pro Preview and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Gemini 3.1 Pro 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 3.1 Pro Preview vs GPT-5.1 Codex Max: Which Is Better?

Updated Feb 2026

Our Verdict

Gemini 3.1 Pro Preview

GPT-5.1 Codex Max

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

Too close to call

API pricing

Cost per 1M tokens

Gemini 3.1 Pro Preview

Input

$2.00

Output

$12.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

51%

Gemini 3.1 Pro Preview uses 5.8x more headings

Gemini 3.1 Pro Preview

GPT-5.1 Codex Max

54%Vocabulary60%

18wSentence Length16w

0.29Hedging0.36

4.9Bold2.3

3.3Lists4.2

0.00Emoji0.00

0.72Headings0.12

0.14Transitions0.03

Based on 23 + 13 text responses

Research

What we learned reading every model

Gemini 3.1 Pro 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 Thinking Machines: InklingNew provider

GPT-5.1 Codex Max vs Gemini 3.6 FlashCross-provider

Updated Feb 2026

Our Verdict

Gemini 3.1 Pro Preview

GPT-5.1 Codex Max

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

Too close to call

API pricing

Cost per 1M tokens

Gemini 3.1 Pro Preview

Input

$2.00

Output

$12.00

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

51%

Gemini 3.1 Pro Preview uses 5.8x more headings

Gemini 3.1 Pro Preview

GPT-5.1 Codex Max

54%Vocabulary60%

18wSentence Length16w

0.29Hedging0.36

4.9Bold2.3

3.3Lists4.2

0.00Emoji0.00

0.72Headings0.12

0.14Transitions0.03

Based on 23 + 13 text responses

Research

What we learned reading every model

Gemini 3.1 Pro 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 Thinking Machines: InklingNew provider

GPT-5.1 Codex Max vs Gemini 3.6 FlashCross-provider