What is the difference between GPT-5.1-Codex and Grok 3?

GPT-5.1-Codex is developed by OpenAI while Grok 3 is developed by xAI. GPT-5.1-Codex has a 400K token context window vs Grok 3's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Grok 3?

It depends on your use case. GPT-5.1-Codex and Grok 3 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 GPT-5.1-Codex and Grok 3 on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Grok 3 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 GPT-5.1-Codex and Grok 3?

GPT-5.1-Codex is developed by OpenAI while Grok 3 is developed by xAI. GPT-5.1-Codex has a 400K token context window vs Grok 3's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Grok 3?

It depends on your use case. GPT-5.1-Codex and Grok 3 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 GPT-5.1-Codex and Grok 3 on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Grok 3 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.

GPT-5.1-Codex vs Grok 3: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1-Codex

Grok 3Runner-up

No community votes yet. On paper, GPT-5.1-Codex has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1-Codex

Input

$1.25

Output

$10.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

41%

Grok 3 uses 3.9x more emoji

GPT-5.1-Codex

Grok 3

70%Vocabulary49%

17wSentence Length18w

0.39Hedging0.94

3.4Bold2.5

3.5Lists3.0

0.00Emoji0.04

0.50Headings0.65

0.38Transitions0.08

Based on 14 + 17 text responses

Research

What we learned reading every model

GPT-5.1-Codex and Grok 3 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 vs MiniMax M3New provider

GPT-5.1-Codex vs Llama 4 MaverickNew provider

GPT-5.1-Codex vs Gemini 2.5 Pro (I/O Edition)New provider

Updated Nov 2025

Our Verdict

GPT-5.1-Codex

Grok 3Runner-up

No community votes yet. On paper, GPT-5.1-Codex has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1-Codex

Input

$1.25

Output

$10.00

Grok 3

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

41%

Grok 3 uses 3.9x more emoji

GPT-5.1-Codex

Grok 3

70%Vocabulary49%

17wSentence Length18w

0.39Hedging0.94

3.4Bold2.5

3.5Lists3.0

0.00Emoji0.04

0.50Headings0.65

0.38Transitions0.08

Based on 14 + 17 text responses

Research

What we learned reading every model

GPT-5.1-Codex and Grok 3 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 vs MiniMax M3New provider

GPT-5.1-Codex vs Llama 4 MaverickNew provider

GPT-5.1-Codex vs Gemini 2.5 Pro (I/O Edition)New provider