What is the difference between DeepSeek R1 and GPT-5.1 Codex Max?

DeepSeek R1 is developed by DeepSeek 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, DeepSeek R1 or GPT-5.1 Codex Max?

It depends on your use case. DeepSeek R1 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 DeepSeek R1 and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of DeepSeek R1 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 R1 and GPT-5.1 Codex Max?

DeepSeek R1 is developed by DeepSeek 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, DeepSeek R1 or GPT-5.1 Codex Max?

It depends on your use case. DeepSeek R1 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 DeepSeek R1 and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of DeepSeek R1 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 R1 vs GPT-5.1 Codex Max: Which Is Better?

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

DeepSeek R1Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek R1

Input

$0.55

Output

$2.19

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

21%

DeepSeek R1 uses 4.3x more emoji

DeepSeek R1

GPT-5.1 Codex Max

62%Vocabulary60%

15wSentence Length16w

0.52Hedging0.36

8.0Bold2.3

5.7Lists4.2

0.04Emoji0.00

0.62Headings0.12

0.28Transitions0.03

Based on 22 + 13 text responses

Research

What we learned reading every model

DeepSeek R1 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

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DeepSeek R1 vs Grok 3New provider

DeepSeek R1 vs Llama 4 MaverickNew provider

Updated Dec 2025

Our Verdict

GPT-5.1 Codex Max

DeepSeek R1Runner-up

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek R1

Input

$0.55

Output

$2.19

GPT-5.1 Codex Max

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

21%

DeepSeek R1 uses 4.3x more emoji

DeepSeek R1

GPT-5.1 Codex Max

62%Vocabulary60%

15wSentence Length16w

0.52Hedging0.36

8.0Bold2.3

5.7Lists4.2

0.04Emoji0.00

0.62Headings0.12

0.28Transitions0.03

Based on 22 + 13 text responses

Research

What we learned reading every model

DeepSeek R1 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

DeepSeek R1 vs MiniMax M3New provider

DeepSeek R1 vs Grok 3New provider

DeepSeek R1 vs Llama 4 MaverickNew provider