What is the difference between Grok 4.1 Fast and OpenAI o3?

Grok 4.1 Fast is developed by xAI while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.1 Fast or OpenAI o3?

It depends on your use case. Grok 4.1 Fast and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Grok 4.1 Fast and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and OpenAI o3 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 Grok 4.1 Fast and OpenAI o3?

Grok 4.1 Fast is developed by xAI while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.1 Fast or OpenAI o3?

It depends on your use case. Grok 4.1 Fast and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Grok 4.1 Fast and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and OpenAI o3 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.

Grok 4.1 Fast vs OpenAI o3: Which Is Better?

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

OpenAI o3

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 Grok 4.1 Fast and OpenAI o3 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

OpenAI o3

Input

$10.00

Output

$40.00

Writing DNA

Style Comparison

Similarity

83%

Grok 4.1 Fast uses 6.7x more bold

Grok 4.1 Fast

OpenAI o3

67%Vocabulary68%

15wSentence Length14w

0.17Hedging0.26

4.7Bold0.7

3.7Lists3.0

0.00Emoji0.00

0.99Headings0.38

0.14Transitions0.12

Based on 24 + 16 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

OpenAI o3 vs MiniMax M3New provider

OpenAI o3 vs Ox AlphaNew provider

Grok 4.1 Fast vs Gemini 2.5 Pro Preview 06-05New provider

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

OpenAI o3

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 Grok 4.1 Fast and OpenAI o3 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

OpenAI o3

Input

$10.00

Output

$40.00

Writing DNA

Style Comparison

Similarity

83%

Grok 4.1 Fast uses 6.7x more bold

Grok 4.1 Fast

OpenAI o3

67%Vocabulary68%

15wSentence Length14w

0.17Hedging0.26

4.7Bold0.7

3.7Lists3.0

0.00Emoji0.00

0.99Headings0.38

0.14Transitions0.12

Based on 24 + 16 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

OpenAI o3 vs MiniMax M3New provider

OpenAI o3 vs Ox AlphaNew provider

Grok 4.1 Fast vs Gemini 2.5 Pro Preview 06-05New provider