What is the difference between Gemini 3 Pro Preview and xAI: Grok 4 Fast (free)?

Gemini 3 Pro Preview is developed by Google AI while xAI: Grok 4 Fast (free) is developed by xAI. You can compare their actual outputs across 33 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Pro Preview or xAI: Grok 4 Fast (free)?

It depends on your use case. Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 33 challenges so you can judge which fits your needs best.

How can I compare Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) on Rival?

This page shows a side-by-side comparison of Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) 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 Gemini 3 Pro Preview and xAI: Grok 4 Fast (free)?

Gemini 3 Pro Preview is developed by Google AI while xAI: Grok 4 Fast (free) is developed by xAI. You can compare their actual outputs across 33 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Pro Preview or xAI: Grok 4 Fast (free)?

It depends on your use case. Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 33 challenges so you can judge which fits your needs best.

How can I compare Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) on Rival?

This page shows a side-by-side comparison of Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) 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.

Gemini 3 Pro Preview vs xAI: Grok 4 Fast (free): Which Is Better?

Updated Nov 2025

Our Verdict

Gemini 3 Pro Preview

xAI: Grok 4 Fast (free)Runner-up

No community votes yet. On paper, Gemini 3 Pro Preview has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Gemini 3 Pro Preview

Input

—

Output

—

xAI: Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

48%

Gemini 3 Pro Preview uses 5.6x more bold

Gemini 3 Pro Preview

xAI: Grok 4 Fast (free)

58%Vocabulary65%

17wSentence Length13w

0.37Hedging0.56

7.7Bold1.4

4.8Lists2.5

0.00Emoji0.00

0.90Headings1.58

0.25Transitions0.28

Based on 23 + 14 text responses

Research

What we learned reading every model

Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) 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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xAI: Grok 4 Fast (free) vs MiniMax M3New provider

xAI: Grok 4 Fast (free) vs OpenAI o3New provider

xAI: Grok 4 Fast (free) vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

Gemini 3 Pro Preview

xAI: Grok 4 Fast (free)Runner-up

No community votes yet. On paper, Gemini 3 Pro Preview has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Gemini 3 Pro Preview

Input

—

Output

—

xAI: Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Writing DNA

Style Comparison

Similarity

48%

Gemini 3 Pro Preview uses 5.6x more bold

Gemini 3 Pro Preview

xAI: Grok 4 Fast (free)

58%Vocabulary65%

17wSentence Length13w

0.37Hedging0.56

7.7Bold1.4

4.8Lists2.5

0.00Emoji0.00

0.90Headings1.58

0.25Transitions0.28

Based on 23 + 14 text responses

Research

What we learned reading every model

Gemini 3 Pro Preview and xAI: Grok 4 Fast (free) 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

xAI: Grok 4 Fast (free) vs MiniMax M3New provider

xAI: Grok 4 Fast (free) vs OpenAI o3New provider

xAI: Grok 4 Fast (free) vs Llama 4 MaverickNew provider