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

Grok 4.1 Fast is developed by xAI while o3 Mini 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 o3 Mini?

It depends on your use case. Grok 4.1 Fast and o3 Mini 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 o3 Mini on Rival?

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

Grok 4.1 Fast is developed by xAI while o3 Mini 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 o3 Mini?

It depends on your use case. Grok 4.1 Fast and o3 Mini 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 o3 Mini on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and o3 Mini 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 o3 Mini: Which Is Better?

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

o3 MiniRunner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

o3 Mini

Input

$1.10

Output

$4.40

Writing DNA

Style Comparison

Similarity

49%

o3 Mini uses 4.3x more hedging

Grok 4.1 Fast

o3 Mini

67%Vocabulary65%

15wSentence Length17w

0.17Hedging0.74

4.7Bold3.9

3.7Lists1.7

0.00Emoji0.00

0.99Headings0.47

0.14Transitions0.38

Based on 24 + 12 text responses

Research

What we learned reading every model

Grok 4.1 Fast and o3 Mini 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

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o3 Mini vs Llama 4 MaverickNew provider

o3 Mini vs Gemini 2.5 Pro (I/O Edition)New provider

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

o3 MiniRunner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

o3 Mini

Input

$1.10

Output

$4.40

Writing DNA

Style Comparison

Similarity

49%

o3 Mini uses 4.3x more hedging

Grok 4.1 Fast

o3 Mini

67%Vocabulary65%

15wSentence Length17w

0.17Hedging0.74

4.7Bold3.9

3.7Lists1.7

0.00Emoji0.00

0.99Headings0.47

0.14Transitions0.38

Based on 24 + 12 text responses

Research

What we learned reading every model

Grok 4.1 Fast and o3 Mini 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

o3 Mini vs MiniMax M3New provider

o3 Mini vs Llama 4 MaverickNew provider

o3 Mini vs Gemini 2.5 Pro (I/O Edition)New provider