What is the difference between xAI: Grok 4.5 and o3 Mini?

xAI: Grok 4.5 is developed by xAI while o3 Mini is developed by OpenAI. xAI: Grok 4.5 has a 500K token context window vs o3 Mini's 64K. 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 o3 Mini?

It depends on your use case. xAI: Grok 4.5 and o3 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 4.5 cost compared to o3 Mini?

xAI: Grok 4.5 costs $2/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini 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 o3 Mini on Rival?

This page shows a side-by-side comparison of xAI: Grok 4.5 and o3 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 4.5 and o3 Mini?

xAI: Grok 4.5 is developed by xAI while o3 Mini is developed by OpenAI. xAI: Grok 4.5 has a 500K token context window vs o3 Mini's 64K. 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 o3 Mini?

It depends on your use case. xAI: Grok 4.5 and o3 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 4.5 cost compared to o3 Mini?

xAI: Grok 4.5 costs $2/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini 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 o3 Mini on Rival?

This page shows a side-by-side comparison of xAI: Grok 4.5 and o3 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 4.5 vs o3 Mini: Which Is Better?

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

o3 MiniRunner-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

o3 Mini

Input

$1.10

1.8× cheaper

Output

$4.40

1.4× cheaper

o3 Mini is cheaper on both — 1.8× input, 1.4× output

Writing DNA

Style Comparison

Similarity

55%

xAI: Grok 4.5 uses 9.0x more emoji

xAI: Grok 4.5

o3 Mini

61%Vocabulary65%

16wSentence Length17w

0.23Hedging0.74

2.5Bold3.9

2.4Lists1.7

0.09Emoji0.00

0.48Headings0.47

0.06Transitions0.38

Based on 27 + 12 text responses

Research

What we learned reading every model

xAI: Grok 4.5 and o3 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

o3 Mini vs MiniMax M3New provider

o3 Mini vs Claude Sonnet 4New provider

o3 Mini vs xAI: Grok 4Cross-provider

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

o3 MiniRunner-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

o3 Mini

Input

$1.10

1.8× cheaper

Output

$4.40

1.4× cheaper

o3 Mini is cheaper on both — 1.8× input, 1.4× output

Writing DNA

Style Comparison

Similarity

55%

xAI: Grok 4.5 uses 9.0x more emoji

xAI: Grok 4.5

o3 Mini

61%Vocabulary65%

16wSentence Length17w

0.23Hedging0.74

2.5Bold3.9

2.4Lists1.7

0.09Emoji0.00

0.48Headings0.47

0.06Transitions0.38

Based on 27 + 12 text responses

Research

What we learned reading every model

xAI: Grok 4.5 and o3 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

o3 Mini vs MiniMax M3New provider

o3 Mini vs Claude Sonnet 4New provider

o3 Mini vs xAI: Grok 4Cross-provider