What is the difference between GPT-5.1 and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or OpenAI o4-mini?

It depends on your use case. GPT-5.1 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to OpenAI o4-mini?

GPT-5.1 costs $1.25/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $0.15/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-5.1 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT-5.1 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-5.1 and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or OpenAI o4-mini?

It depends on your use case. GPT-5.1 and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5.1 cost compared to OpenAI o4-mini?

GPT-5.1 costs $1.25/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $0.15/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-5.1 and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT-5.1 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.

GPT-5.1 vs OpenAI o4-mini: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1

OpenAI o4-miniRunner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

OpenAI o4-mini

Input

$1.10

1.1× cheaper

Output

$4.40

2.3× cheaper

OpenAI o4-mini is cheaper on both — 1.1× input, 2.3× output

Writing DNA

Style Comparison

Similarity

71%

GPT-5.1 uses 349.6x more bold

GPT-5.1

OpenAI o4-mini

62%Vocabulary73%

19wSentence Length15w

0.29Hedging0.18

3.5Bold0.0

7.2Lists2.1

0.00Emoji0.00

0.61Headings0.00

0.03Transitions0.02

Based on 14 + 10 text responses

Research

What we learned reading every model

GPT-5.1 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

GPT-5.1 vs MiniMax M3New provider

GPT-5.1 vs Grok 3New provider

GPT-5.1 vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

GPT-5.1

OpenAI o4-miniRunner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1

Input

$1.25

Output

$10.00

OpenAI o4-mini

Input

$1.10

1.1× cheaper

Output

$4.40

2.3× cheaper

OpenAI o4-mini is cheaper on both — 1.1× input, 2.3× output

Writing DNA

Style Comparison

Similarity

71%

GPT-5.1 uses 349.6x more bold

GPT-5.1

OpenAI o4-mini

62%Vocabulary73%

19wSentence Length15w

0.29Hedging0.18

3.5Bold0.0

7.2Lists2.1

0.00Emoji0.00

0.61Headings0.00

0.03Transitions0.02

Based on 14 + 10 text responses

Research

What we learned reading every model

GPT-5.1 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

GPT-5.1 vs MiniMax M3New provider

GPT-5.1 vs Grok 3New provider

GPT-5.1 vs Llama 4 MaverickNew provider