What is the difference between xAI: Grok 4.5 and OpenAI o4 Mini High?

xAI: Grok 4.5 is developed by xAI while OpenAI o4 Mini High is developed by OpenAI. xAI: Grok 4.5 has a 500K token context window vs OpenAI o4 Mini High's 200K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, xAI: Grok 4.5 or OpenAI o4 Mini High?

It depends on your use case. xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 cost compared to OpenAI o4 Mini High?

xAI: Grok 4.5 costs $2/M input tokens and OpenAI o4 Mini High costs $1.1/M input tokens. OpenAI o4 Mini High is $0.90/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 4.5 and OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 and OpenAI o4 Mini High?

xAI: Grok 4.5 is developed by xAI while OpenAI o4 Mini High is developed by OpenAI. xAI: Grok 4.5 has a 500K token context window vs OpenAI o4 Mini High's 200K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, xAI: Grok 4.5 or OpenAI o4 Mini High?

It depends on your use case. xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 cost compared to OpenAI o4 Mini High?

xAI: Grok 4.5 costs $2/M input tokens and OpenAI o4 Mini High costs $1.1/M input tokens. OpenAI o4 Mini High is $0.90/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 4.5 and OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 vs OpenAI o4 Mini High: Which Is Better?

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

OpenAI o4 Mini HighRunner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

xAI: Grok 4.5

Input

$2.00

Output

$6.00

OpenAI o4 Mini High

Input

$1.10

1.8× cheaper

Output

$4.40

1.4× cheaper

OpenAI o4 Mini High is cheaper on both — 1.8× input, 1.4× output

Writing DNA

Style Comparison

Similarity

71%

xAI: Grok 4.5 uses 245.4x more bold

xAI: Grok 4.5

OpenAI o4 Mini High

61%Vocabulary70%

16wSentence Length18w

0.23Hedging0.33

2.5Bold0.0

2.4Lists1.3

0.09Emoji0.02

0.48Headings0.00

0.06Transitions0.04

Based on 27 + 14 text responses

Research

What we learned reading every model

xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 vs MiniMax M3New provider

xAI: Grok 4.5 vs Claude Sonnet 4New provider

OpenAI o4 Mini High vs xAI: Grok 4Cross-provider

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

OpenAI o4 Mini HighRunner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

xAI: Grok 4.5

Input

$2.00

Output

$6.00

OpenAI o4 Mini High

Input

$1.10

1.8× cheaper

Output

$4.40

1.4× cheaper

OpenAI o4 Mini High is cheaper on both — 1.8× input, 1.4× output

Writing DNA

Style Comparison

Similarity

71%

xAI: Grok 4.5 uses 245.4x more bold

xAI: Grok 4.5

OpenAI o4 Mini High

61%Vocabulary70%

16wSentence Length18w

0.23Hedging0.33

2.5Bold0.0

2.4Lists1.3

0.09Emoji0.02

0.48Headings0.00

0.06Transitions0.04

Based on 27 + 14 text responses

Research

What we learned reading every model

xAI: Grok 4.5 and OpenAI o4 Mini High 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 4.5 vs MiniMax M3New provider

xAI: Grok 4.5 vs Claude Sonnet 4New provider

OpenAI o4 Mini High vs xAI: Grok 4Cross-provider