What is the difference between Grok 4.1 Fast and Horizon Alpha?

Grok 4.1 Fast is developed by xAI while Horizon Alpha is developed by OpenRouter. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.1 Fast or Horizon Alpha?

It depends on your use case. Grok 4.1 Fast and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

How can I compare Grok 4.1 Fast and Horizon Alpha on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and Horizon Alpha 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 Horizon Alpha?

Grok 4.1 Fast is developed by xAI while Horizon Alpha is developed by OpenRouter. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.1 Fast or Horizon Alpha?

It depends on your use case. Grok 4.1 Fast and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

How can I compare Grok 4.1 Fast and Horizon Alpha on Rival?

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

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

Horizon AlphaRunner-up

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

Slight edge

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

Horizon Alpha

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

61%

Grok 4.1 Fast uses 466.5x more bold

Grok 4.1 Fast

Horizon Alpha

67%Vocabulary65%

15wSentence Length14w

0.17Hedging0.22

4.7Bold0.0

3.7Lists3.5

0.00Emoji0.00

0.99Headings0.00

0.14Transitions0.12

Based on 24 + 14 text responses

Research

What we learned reading every model

Grok 4.1 Fast and Horizon Alpha 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

Horizon Alpha vs MiniMax M3New provider

Grok 4.1 Fast vs OpenAI o3New provider

Grok 4.1 Fast vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

Grok 4.1 Fast

Horizon AlphaRunner-up

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

Slight edge

API pricing

Cost per 1M tokens

Grok 4.1 Fast

Input

—

Output

—

Horizon Alpha

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

61%

Grok 4.1 Fast uses 466.5x more bold

Grok 4.1 Fast

Horizon Alpha

67%Vocabulary65%

15wSentence Length14w

0.17Hedging0.22

4.7Bold0.0

3.7Lists3.5

0.00Emoji0.00

0.99Headings0.00

0.14Transitions0.12

Based on 24 + 14 text responses

Research

What we learned reading every model

Grok 4.1 Fast and Horizon Alpha 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

Horizon Alpha vs MiniMax M3New provider

Grok 4.1 Fast vs OpenAI o3New provider

Grok 4.1 Fast vs Llama 4 MaverickNew provider