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

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5.1 Chat and OpenAI o4-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 GPT-5.1 Chat cost compared to OpenAI o4-mini?

GPT-5.1 Chat 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 Chat and OpenAI o4-mini on Rival?

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

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-5.1 Chat and OpenAI o4-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 GPT-5.1 Chat cost compared to OpenAI o4-mini?

GPT-5.1 Chat 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 Chat and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT-5.1 Chat 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 Chat vs OpenAI o4-mini: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1 Chat

OpenAI o4-miniRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1 Chat

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 Chat uses 108.9x more bold

GPT-5.1 Chat

OpenAI o4-mini

73%Vocabulary73%

18wSentence Length15w

0.45Hedging0.18

1.1Bold0.0

2.4Lists2.1

0.00Emoji0.00

0.00Headings0.00

0.06Transitions0.02

Based on 15 + 10 text responses

Research

What we learned reading every model

GPT-5.1 Chat 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 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Claude Sonnet 4New provider

GPT-5.1 Chat vs xAI: Grok 4New provider

Updated Nov 2025

Our Verdict

GPT-5.1 Chat

OpenAI o4-miniRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

GPT-5.1 Chat

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 Chat uses 108.9x more bold

GPT-5.1 Chat

OpenAI o4-mini

73%Vocabulary73%

18wSentence Length15w

0.45Hedging0.18

1.1Bold0.0

2.4Lists2.1

0.00Emoji0.00

0.00Headings0.00

0.06Transitions0.02

Based on 15 + 10 text responses

Research

What we learned reading every model

GPT-5.1 Chat 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 Chat vs MiniMax M3New provider

GPT-5.1 Chat vs Claude Sonnet 4New provider

GPT-5.1 Chat vs xAI: Grok 4New provider