GPT OSS 120B vs Grok 3
Compare GPT OSS 120B by OpenAI against Grok 3 by xAI, context windows of 131K vs 128K, tested across 53 shared challenges. Updated May 2026.
Which is better, GPT OSS 120B or Grok 3?
GPT OSS 120B and Grok 3 are both competitive models. Context windows: 131K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT OSS 120B and Grok 3
GPT OSS 120B is made by openai while Grok 3 is from xai. GPT OSS 120B has a 131K token context window compared to Grok 3's 128K.
API pricing
Per 1M tokens
GPT OSS 120B
Input
$0.18
Output
$0.80
Grok 3
Input
—
Output
—
Our Verdict
GPT OSS 120B
Grok 3
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
Writing DNA
Style Comparison
Similarity
51%
GPT OSS 120B uses 3.9x more emoji
GPT OSS 120B
Grok 3
52%Vocabulary49%
19wSentence Length18w
0.28Hedging0.94
7.4Bold2.5
1.8Lists3.0
0.15Emoji0.04
0.73Headings0.65
0.17Transitions0.08
Based on 21 + 17 text responses
FAQ
