What is the difference between GPT-4.5 and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or OpenAI o4-mini?

It depends on your use case. GPT-4.5 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to OpenAI o4-mini?

GPT-4.5 costs $75/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $73.90/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 GPT-4.5 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT-4.5 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 GPT-4.5 and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or OpenAI o4-mini?

It depends on your use case. GPT-4.5 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to OpenAI o4-mini?

GPT-4.5 costs $75/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $73.90/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 GPT-4.5 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT-4.5 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.

Updated Apr 2025

GPT-4.5vsOpenAI o4-mini

OpenAI o4-mini is cheaper than GPT-4.5 at $1.1/M vs $75/M input tokens.

GPT-4.5 and OpenAI o4-mini compared across 25 shared prompts
Spec	GPT-4.5	OpenAI o4-mini
Input price	$75/M tokens	$1.1/M tokens
Output price	$150/M tokens	$4.4/M tokens
Context window	128K tokens	—
Released	Feb 2025	Apr 2025
SWE-bench Verified	28.0%	68.1%

Our Verdict

GPT-4.5

OpenAI o4-mini

Not enough votes to call it. On the specs, nothing separates them.

OpenAI o4-mini costs 34x less per token.

Too close to call

What do GPT-4.5 and OpenAI o4-mini 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-4.5

Input

$75.00

Output

$150.00

OpenAI o4-mini

Input

$1.10

68× cheaper

Output

$4.40

34× cheaper

OpenAI o4-mini is cheaper on both — 68× input, 34× output

Writing DNA

Style Comparison

Similarity

50%

GPT-4.5 uses 466.6x more bold

GPT-4.5

OpenAI o4-mini

63%Vocabulary73%

16wSentence Length15w

0.57Hedging0.18

4.7Bold0.0

6.4Lists2.1

0.00Emoji0.00

1.30Headings0.00

0.54Transitions0.02

Based on 11 + 10 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.5 vs Ox AlphaNew provider

GPT-4.5 vs Llama 4 MaverickNew provider

OpenAI o4-mini vs GPT-5Same lab

GPT-4.5 vs MiniMax M3New provider

GPT-4.5 vs Gemini 2.5 Pro (I/O Edition)New provider

GPT-4.5 vs Gemini 2.5 Pro Preview 06-05New provider

GPT-4.5 vs Gemini 3 Flash PreviewNew provider

GPT-4.5 vs Gemini 3 Pro PreviewNew provider

Updated Apr 2025

GPT-4.5vsOpenAI o4-mini

OpenAI o4-mini is cheaper than GPT-4.5 at $1.1/M vs $75/M input tokens.

GPT-4.5 and OpenAI o4-mini compared across 25 shared prompts
Spec	GPT-4.5	OpenAI o4-mini
Input price	$75/M tokens	$1.1/M tokens
Output price	$150/M tokens	$4.4/M tokens
Context window	128K tokens	—
Released	Feb 2025	Apr 2025
SWE-bench Verified	28.0%	68.1%

Our Verdict

GPT-4.5

OpenAI o4-mini

Not enough votes to call it. On the specs, nothing separates them.

OpenAI o4-mini costs 34x less per token.

Too close to call

What do GPT-4.5 and OpenAI o4-mini 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-4.5

Input

$75.00

Output

$150.00

OpenAI o4-mini

Input

$1.10

68× cheaper

Output

$4.40

34× cheaper

OpenAI o4-mini is cheaper on both — 68× input, 34× output

Writing DNA

Style Comparison

Similarity

50%

GPT-4.5 uses 466.6x more bold

GPT-4.5

OpenAI o4-mini

63%Vocabulary73%

16wSentence Length15w

0.57Hedging0.18

4.7Bold0.0

6.4Lists2.1

0.00Emoji0.00

1.30Headings0.00

0.54Transitions0.02

Based on 11 + 10 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-4.5 vs Ox AlphaNew provider

GPT-4.5 vs Llama 4 MaverickNew provider

OpenAI o4-mini vs GPT-5Same lab

GPT-4.5 vs MiniMax M3New provider

GPT-4.5 vs Gemini 2.5 Pro (I/O Edition)New provider

GPT-4.5 vs Gemini 2.5 Pro Preview 06-05New provider

GPT-4.5 vs Gemini 3 Flash PreviewNew provider

GPT-4.5 vs Gemini 3 Pro PreviewNew provider