Grok 3 vs OpenAI o3
Compare Grok 3 by xAI against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated May 2026.
Which is better, Grok 3 or OpenAI o3?
Grok 3 and OpenAI o3 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Grok 3 and OpenAI o3
Grok 3 is made by xai while OpenAI o3 is from openai.
API pricing
Per 1M tokens
Grok 3
Input
—
Output
—
OpenAI o3
Input
$10.00
Output
$40.00
Our Verdict
Grok 3
OpenAI o3
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
44%
Grok 3 uses 3.9x more emoji
Grok 3
OpenAI o3
49%Vocabulary68%
18wSentence Length14w
0.94Hedging0.26
2.5Bold0.7
3.0Lists3.0
0.04Emoji0.00
0.65Headings0.38
0.08Transitions0.12
Based on 17 + 16 text responses
FAQ
