What is the difference between xAI: Grok 4 and OpenAI o4-mini?

xAI: Grok 4 is developed by xAI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, xAI: Grok 4 or OpenAI o4-mini?

It depends on your use case. xAI: Grok 4 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does xAI: Grok 4 cost compared to OpenAI o4-mini?

xAI: Grok 4 costs $3/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $1.90/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare xAI: Grok 4 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of xAI: Grok 4 and OpenAI o4-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 xAI: Grok 4 and OpenAI o4-mini?

xAI: Grok 4 is developed by xAI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, xAI: Grok 4 or OpenAI o4-mini?

It depends on your use case. xAI: Grok 4 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does xAI: Grok 4 cost compared to OpenAI o4-mini?

xAI: Grok 4 costs $3/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $1.90/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare xAI: Grok 4 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of xAI: Grok 4 and OpenAI o4-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.

xAI: Grok 4 vs OpenAI o4-mini: Which Is Better?

Updated Jul 2025

Our Verdict

xAI: Grok 4

OpenAI o4-miniRunner-up

No community votes yet. On paper, xAI: Grok 4 has the edge — bigger model tier, newer, bigger context window.

OpenAI o4-mini is 3.4x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

xAI: Grok 4

Input

$3.00

Output

$15.00

OpenAI o4-mini

Input

$1.10

2.7× cheaper

Output

$4.40

3.4× cheaper

OpenAI o4-mini is cheaper on both — 2.7× input, 3.4× output

Writing DNA

Style Comparison

Similarity

43%

xAI: Grok 4 uses 267.9x more bold

xAI: Grok 4

OpenAI o4-mini

53%Vocabulary73%

18wSentence Length15w

0.67Hedging0.18

2.7Bold0.0

2.7Lists2.1

0.07Emoji0.00

0.86Headings0.00

0.04Transitions0.02

Based on 21 + 10 text responses

Research

What we learned reading every model

xAI: Grok 4 and OpenAI o4-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

xAI: Grok 4 vs MiniMax M3New provider

xAI: Grok 4 vs Claude Sonnet 4New provider

xAI: Grok 4 vs Aurora AlphaNew provider

Updated Jul 2025

Our Verdict

xAI: Grok 4

OpenAI o4-miniRunner-up

No community votes yet. On paper, xAI: Grok 4 has the edge — bigger model tier, newer, bigger context window.

OpenAI o4-mini is 3.4x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

xAI: Grok 4

Input

$3.00

Output

$15.00

OpenAI o4-mini

Input

$1.10

2.7× cheaper

Output

$4.40

3.4× cheaper

OpenAI o4-mini is cheaper on both — 2.7× input, 3.4× output

Writing DNA

Style Comparison

Similarity

43%

xAI: Grok 4 uses 267.9x more bold

xAI: Grok 4

OpenAI o4-mini

53%Vocabulary73%

18wSentence Length15w

0.67Hedging0.18

2.7Bold0.0

2.7Lists2.1

0.07Emoji0.00

0.86Headings0.00

0.04Transitions0.02

Based on 21 + 10 text responses

Research

What we learned reading every model

xAI: Grok 4 and OpenAI o4-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

xAI: Grok 4 vs MiniMax M3New provider

xAI: Grok 4 vs Claude Sonnet 4New provider

xAI: Grok 4 vs Aurora AlphaNew provider