What is the difference between GPT OSS 20B and Grok 4?

GPT OSS 20B is developed by OpenAI while Grok 4 is developed by xAI. GPT OSS 20B has a 131K token context window vs Grok 4's 256K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GPT OSS 20B or Grok 4?

It depends on your use case. GPT OSS 20B and Grok 4 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 OSS 20B cost compared to Grok 4?

GPT OSS 20B costs $0.02/M input tokens and Grok 4 costs $3/M input tokens. GPT OSS 20B is $2.98/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 20B and Grok 4 on Rival?

This page shows a side-by-side comparison of GPT OSS 20B and Grok 4 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

GPT OSS 20BvsGrok 4

GPT OSS 20B is cheaper than Grok 4 at $0.02/M vs $3/M input tokens.

GPT OSS 20B and Grok 4 compared across 53 shared prompts
Spec	GPT OSS 20B	Grok 4
Input price	$0.02/M tokens	$3/M tokens
Output price	$0.1/M tokens	$15/M tokens
Context window	131K tokens	256K tokens
Parameters	21B (3.6B active)	Not disclosed
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Aug 2025	Jul 2025