What is the difference between DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max?

DeepSeek V4 Flash 0731 is developed by DeepSeek while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash 0731 or GPT-5.1 Codex Max?

It depends on your use case. DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

How can I compare DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max?

DeepSeek V4 Flash 0731 is developed by DeepSeek while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash 0731 or GPT-5.1 Codex Max?

It depends on your use case. DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

How can I compare DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 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.

DeepSeek V4 Flash 0731 vs GPT-5.1 Codex Max: Which Is Better?

Updated Jul 2026

Our Verdict

DeepSeek V4 Flash 0731

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

What do DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

Output

$0.28

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

66%

DeepSeek V4 Flash 0731 uses 6.7x more headings

DeepSeek V4 Flash 0731

GPT-5.1 Codex Max

52%Vocabulary60%

18wSentence Length16w

0.38Hedging0.36

5.7Bold2.3

3.4Lists4.2

0.00Emoji0.00

0.83Headings0.12

0.04Transitions0.03

Based on 23 + 13 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

DeepSeek V4 Flash 0731 vs MiniMax M3New provider

DeepSeek V4 Flash 0731 vs Ox AlphaNew provider

DeepSeek V4 Flash 0731 vs Claude Opus 4New provider

Updated Jul 2026

Our Verdict

DeepSeek V4 Flash 0731

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

What do DeepSeek V4 Flash 0731 and GPT-5.1 Codex Max say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

Output

$0.28

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

66%

DeepSeek V4 Flash 0731 uses 6.7x more headings

DeepSeek V4 Flash 0731

GPT-5.1 Codex Max

52%Vocabulary60%

18wSentence Length16w

0.38Hedging0.36

5.7Bold2.3

3.4Lists4.2

0.00Emoji0.00

0.83Headings0.12

0.04Transitions0.03

Based on 23 + 13 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

DeepSeek V4 Flash 0731 vs MiniMax M3New provider

DeepSeek V4 Flash 0731 vs Ox AlphaNew provider

DeepSeek V4 Flash 0731 vs Claude Opus 4New provider