What is the difference between GPT OSS 120B and Grok 4.1 Fast?

GPT OSS 120B is developed by OpenAI while Grok 4.1 Fast is developed by xAI. 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 Grok 4.1 Fast?

It depends on your use case. GPT OSS 120B and Grok 4.1 Fast 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 can I compare GPT OSS 120B and Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of GPT OSS 120B and Grok 4.1 Fast 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 Grok 4.1 Fast?

GPT OSS 120B is developed by OpenAI while Grok 4.1 Fast is developed by xAI. 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 Grok 4.1 Fast?

It depends on your use case. GPT OSS 120B and Grok 4.1 Fast 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 can I compare GPT OSS 120B and Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of GPT OSS 120B and Grok 4.1 Fast 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 Grok 4.1 Fast: Which Is Better?

Updated Nov 2025

Our Verdict

GPT OSS 120B

Grok 4.1 Fast

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

Output

$0.80

Grok 4.1 Fast

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

63%

GPT OSS 120B uses 15.4x more emoji

GPT OSS 120B

Grok 4.1 Fast

52%Vocabulary67%

19wSentence Length15w

0.28Hedging0.17

7.4Bold4.7

1.8Lists3.7

0.15Emoji0.00

0.73Headings0.99

0.17Transitions0.14

Based on 21 + 24 text responses

Research

What we learned reading every model

GPT OSS 120B and Grok 4.1 Fast 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 Llama 4 MaverickNew provider

GPT OSS 120B vs Gemini 2.5 Pro (I/O Edition)New provider

Updated Nov 2025

Our Verdict

GPT OSS 120B

Grok 4.1 Fast

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

GPT OSS 120B

Input

$0.18

Output

$0.80

Grok 4.1 Fast

Input

—

Output

—

Writing DNA

Style Comparison

Similarity

63%

GPT OSS 120B uses 15.4x more emoji

GPT OSS 120B

Grok 4.1 Fast

52%Vocabulary67%

19wSentence Length15w

0.28Hedging0.17

7.4Bold4.7

1.8Lists3.7

0.15Emoji0.00

0.73Headings0.99

0.17Transitions0.14

Based on 21 + 24 text responses

Research

What we learned reading every model

GPT OSS 120B and Grok 4.1 Fast 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 Llama 4 MaverickNew provider

GPT OSS 120B vs Gemini 2.5 Pro (I/O Edition)New provider