What is the difference between Grok 4.1 Fast and Grok 4.5?

Both are developed by xAI but target different use cases. 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 Grok 4.5?

It depends on your use case. Grok 4.1 Fast and Grok 4.5 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 Grok 4.5 on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and Grok 4.5 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 Grok 4.5?

Both are developed by xAI but target different use cases. 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 Grok 4.5?

It depends on your use case. Grok 4.1 Fast and Grok 4.5 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 Grok 4.5 on Rival?

This page shows a side-by-side comparison of Grok 4.1 Fast and Grok 4.5 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 Grok 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.1 Fast

Grok 4.5

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 Grok 4.5 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

—

Grok 4.5

Input

$2.00

Output

$6.00

Writing DNA

Style Comparison

Similarity

79%

Grok 4.5 uses 9.0x more emoji

Grok 4.1 Fast

Grok 4.5

67%Vocabulary61%

15wSentence Length16w

0.17Hedging0.23

4.7Bold2.5

3.7Lists2.4

0.00Emoji0.09

0.99Headings0.48

0.14Transitions0.06

Based on 24 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.1 Fast vs OpenAI o3New provider

Updated Jul 2026

Our Verdict

Grok 4.1 Fast

Grok 4.5

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 Grok 4.5 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

—

Grok 4.5

Input

$2.00

Output

$6.00

Writing DNA

Style Comparison

Similarity

79%

Grok 4.5 uses 9.0x more emoji

Grok 4.1 Fast

Grok 4.5

67%Vocabulary61%

15wSentence Length16w

0.17Hedging0.23

4.7Bold2.5

3.7Lists2.4

0.00Emoji0.09

0.99Headings0.48

0.14Transitions0.06

Based on 24 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.1 Fast vs OpenAI o3New provider