GPT OSS 120B vs xAI: Grok 4.5
Compare GPT OSS 120B by OpenAI against xAI: Grok 4.5 by xAI, context windows of 131K vs 500K, tested across 53 shared challenges.
Our Verdict
GPT OSS 120B
xAI: Grok 4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 120B is 7.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT OSS 120B
Input
$0.18
11× cheaper
Output
$0.80
7.5× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
GPT OSS 120B is cheaper on both — 11× input, 7.5× output
Writing DNA
Style Comparison
Similarity
57%
GPT OSS 120B uses 3.0x more bold
GPT OSS 120B
xAI: Grok 4.5
52%Vocabulary61%
19wSentence Length16w
0.28Hedging0.23
7.4Bold2.5
1.8Lists2.4
0.15Emoji0.09
0.73Headings0.48
0.17Transitions0.06
Based on 21 + 27 text responses
Research
What we learned reading every model
FAQ
