What is the difference between GPT-5 Mini and Grok 4.5?

GPT-5 Mini is developed by OpenAI while Grok 4.5 is developed by xAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Mini or Grok 4.5?

It depends on your use case. GPT-5 Mini 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 much does GPT-5 Mini cost compared to Grok 4.5?

GPT-5 Mini costs $0.25/M input tokens and Grok 4.5 costs $2/M input tokens. GPT-5 Mini is $1.75/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 GPT-5 Mini and Grok 4.5 on Rival?

This page shows a side-by-side comparison of GPT-5 Mini 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 GPT-5 Mini and Grok 4.5?

GPT-5 Mini is developed by OpenAI while Grok 4.5 is developed by xAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Mini or Grok 4.5?

It depends on your use case. GPT-5 Mini 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 much does GPT-5 Mini cost compared to Grok 4.5?

GPT-5 Mini costs $0.25/M input tokens and Grok 4.5 costs $2/M input tokens. GPT-5 Mini is $1.75/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 GPT-5 Mini and Grok 4.5 on Rival?

This page shows a side-by-side comparison of GPT-5 Mini 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.

GPT-5 Mini vs Grok 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.5

GPT-5 MiniRunner-up

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

GPT-5 Mini is 3.0x cheaper per token — worth considering if cost matters.

Too close to call

What do GPT-5 Mini 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

GPT-5 Mini

Input

$0.25

8.0× cheaper

Output

$2.00

3.0× cheaper

Grok 4.5

Input

$2.00

Output

$6.00

GPT-5 Mini is cheaper on both — 8.0× input, 3.0× output

Writing DNA

Style Comparison

Similarity

83%

Grok 4.5 uses 245.4x more bold

GPT-5 Mini

Grok 4.5

62%Vocabulary61%

21wSentence Length16w

0.16Hedging0.23

0.0Bold2.5

3.4Lists2.4

0.00Emoji0.09

0.00Headings0.48

0.05Transitions0.06

Based on 15 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Mini vs MiniMax M3New provider

GPT-5 Mini vs Claude Sonnet 4New provider

GPT-5 Mini vs Grok 4Cross-provider

Updated Jul 2026

Our Verdict

Grok 4.5

GPT-5 MiniRunner-up

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

GPT-5 Mini is 3.0x cheaper per token — worth considering if cost matters.

Too close to call

What do GPT-5 Mini 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

GPT-5 Mini

Input

$0.25

8.0× cheaper

Output

$2.00

3.0× cheaper

Grok 4.5

Input

$2.00

Output

$6.00

GPT-5 Mini is cheaper on both — 8.0× input, 3.0× output

Writing DNA

Style Comparison

Similarity

83%

Grok 4.5 uses 245.4x more bold

GPT-5 Mini

Grok 4.5

62%Vocabulary61%

21wSentence Length16w

0.16Hedging0.23

0.0Bold2.5

3.4Lists2.4

0.00Emoji0.09

0.00Headings0.48

0.05Transitions0.06

Based on 15 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5 Mini vs MiniMax M3New provider

GPT-5 Mini vs Claude Sonnet 4New provider

GPT-5 Mini vs Grok 4Cross-provider