What is the difference between ChatGPT-4o (March 2025) and GPT OSS 120B?

Both are developed by OpenAI but target different use cases. ChatGPT-4o (March 2025) has a 128K token context window vs GPT OSS 120B's 131K. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or GPT OSS 120B?

It depends on your use case. ChatGPT-4o (March 2025) and GPT OSS 120B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to GPT OSS 120B?

ChatGPT-4o (March 2025) costs $5/M input tokens and GPT OSS 120B costs $0.18/M input tokens. GPT OSS 120B is $4.82/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 ChatGPT-4o (March 2025) and GPT OSS 120B on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and GPT OSS 120B 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 ChatGPT-4o (March 2025) and GPT OSS 120B?

Both are developed by OpenAI but target different use cases. ChatGPT-4o (March 2025) has a 128K token context window vs GPT OSS 120B's 131K. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or GPT OSS 120B?

It depends on your use case. ChatGPT-4o (March 2025) and GPT OSS 120B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to GPT OSS 120B?

ChatGPT-4o (March 2025) costs $5/M input tokens and GPT OSS 120B costs $0.18/M input tokens. GPT OSS 120B is $4.82/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 ChatGPT-4o (March 2025) and GPT OSS 120B on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and GPT OSS 120B 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 Aug 2025

ChatGPT-4o (March 2025)vsGPT OSS 120B

GPT OSS 120B is cheaper than ChatGPT-4o (March 2025) at $0.18/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and GPT OSS 120B compared across 32 shared prompts
Spec	ChatGPT-4o (March 2025)	GPT OSS 120B
Input price	$5/M tokens	$0.18/M tokens
Output price	$15/M tokens	$0.8/M tokens
Context window	128K tokens	131K tokens
Released	Mar 2025	Aug 2025
MMLU	89.5%	Matches/exceeds o4-mini

Our Verdict

ChatGPT-4o (March 2025)

GPT OSS 120B

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

GPT OSS 120B costs 19x less per token.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

GPT OSS 120B

Input

$0.18

28× cheaper

Output

$0.80

19× cheaper

GPT OSS 120B is cheaper on both — 28× input, 19× output

Writing DNA

Style Comparison

Similarity

52%

ChatGPT-4o (March 2025) uses 6.1x more emoji

ChatGPT-4o (March 2025)

GPT OSS 120B

55%Vocabulary52%

24wSentence Length19w

0.52Hedging0.28

3.3Bold7.4

6.0Lists1.8

0.94Emoji0.15

0.63Headings0.73

0.05Transitions0.17

Based on 15 + 21 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

ChatGPT-4o (March 2025) vs Ox AlphaNew provider

ChatGPT-4o (March 2025) vs MiniMax M3New provider

GPT OSS 120B vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs Qwen3.8 MaxNew provider

ChatGPT-4o (March 2025) vs Mistral Small 4New provider

ChatGPT-4o (March 2025) vs Mistral Small CreativeNew provider

GPT OSS 120B vs Muse Spark 1.1New provider

ChatGPT-4o (March 2025) vs NVIDIA Nemotron 3 Super (free)New provider

Updated Aug 2025

ChatGPT-4o (March 2025)vsGPT OSS 120B

GPT OSS 120B is cheaper than ChatGPT-4o (March 2025) at $0.18/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and GPT OSS 120B compared across 32 shared prompts
Spec	ChatGPT-4o (March 2025)	GPT OSS 120B
Input price	$5/M tokens	$0.18/M tokens
Output price	$15/M tokens	$0.8/M tokens
Context window	128K tokens	131K tokens
Released	Mar 2025	Aug 2025
MMLU	89.5%	Matches/exceeds o4-mini

Our Verdict

ChatGPT-4o (March 2025)

GPT OSS 120B

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

GPT OSS 120B costs 19x less per token.

Too close to call

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

GPT OSS 120B

Input

$0.18

28× cheaper

Output

$0.80

19× cheaper

GPT OSS 120B is cheaper on both — 28× input, 19× output

Writing DNA

Style Comparison

Similarity

52%

ChatGPT-4o (March 2025) uses 6.1x more emoji

ChatGPT-4o (March 2025)

GPT OSS 120B

55%Vocabulary52%

24wSentence Length19w

0.52Hedging0.28

3.3Bold7.4

6.0Lists1.8

0.94Emoji0.15

0.63Headings0.73

0.05Transitions0.17

Based on 15 + 21 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

ChatGPT-4o (March 2025) vs Ox AlphaNew provider

ChatGPT-4o (March 2025) vs MiniMax M3New provider

GPT OSS 120B vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs Qwen3.8 MaxNew provider

ChatGPT-4o (March 2025) vs Mistral Small 4New provider

ChatGPT-4o (March 2025) vs Mistral Small CreativeNew provider

GPT OSS 120B vs Muse Spark 1.1New provider

ChatGPT-4o (March 2025) vs NVIDIA Nemotron 3 Super (free)New provider