What is the difference between GPT OSS 120B and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT OSS 120B or OpenAI o4-mini?

It depends on your use case. GPT OSS 120B and OpenAI o4-mini 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 OSS 120B cost compared to OpenAI o4-mini?

GPT OSS 120B costs $0.18/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. GPT OSS 120B is $0.92/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 OSS 120B and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT OSS 120B 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 OSS 120B and OpenAI o4-mini?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT OSS 120B or OpenAI o4-mini?

It depends on your use case. GPT OSS 120B and OpenAI o4-mini 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 OSS 120B cost compared to OpenAI o4-mini?

GPT OSS 120B costs $0.18/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. GPT OSS 120B is $0.92/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 OSS 120B and OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of GPT OSS 120B 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 OSS 120B vs OpenAI o4-mini: Which Is Better?

Updated Aug 2025

Our Verdict

GPT OSS 120B

OpenAI o4-miniRunner-up

No community votes yet. On paper, GPT OSS 120B has the edge — bigger model tier, newer, bigger context window.

GPT OSS 120B is 5.5x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

6.1× cheaper

Output

$0.80

5.5× cheaper

OpenAI o4-mini

Input

$1.10

Output

$4.40

GPT OSS 120B is cheaper on both — 6.1× input, 5.5× output

Writing DNA

Style Comparison

Similarity

32%

GPT OSS 120B uses 743.4x more bold

GPT OSS 120B

OpenAI o4-mini

52%Vocabulary73%

19wSentence Length15w

0.28Hedging0.18

7.4Bold0.0

1.8Lists2.1

0.15Emoji0.00

0.73Headings0.00

0.17Transitions0.02

Based on 21 + 10 text responses

Research

What we learned reading every model

GPT OSS 120B 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 OSS 120B vs MiniMax M3New provider

GPT OSS 120B vs Grok 3New provider

GPT OSS 120B vs Llama 4 MaverickNew provider

Updated Aug 2025

Our Verdict

GPT OSS 120B

OpenAI o4-miniRunner-up

No community votes yet. On paper, GPT OSS 120B has the edge — bigger model tier, newer, bigger context window.

GPT OSS 120B is 5.5x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

6.1× cheaper

Output

$0.80

5.5× cheaper

OpenAI o4-mini

Input

$1.10

Output

$4.40

GPT OSS 120B is cheaper on both — 6.1× input, 5.5× output

Writing DNA

Style Comparison

Similarity

32%

GPT OSS 120B uses 743.4x more bold

GPT OSS 120B

OpenAI o4-mini

52%Vocabulary73%

19wSentence Length15w

0.28Hedging0.18

7.4Bold0.0

1.8Lists2.1

0.15Emoji0.00

0.73Headings0.00

0.17Transitions0.02

Based on 21 + 10 text responses

Research

What we learned reading every model

GPT OSS 120B 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 OSS 120B vs MiniMax M3New provider

GPT OSS 120B vs Grok 3New provider

GPT OSS 120B vs Llama 4 MaverickNew provider