xAI: Grok 4 vs OpenAI o3
Compare xAI: Grok 4 by xAI against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated May 2026.
Which is better, xAI: Grok 4 or OpenAI o3?
xAI: Grok 4 and OpenAI o3 are both competitive models. xAI: Grok 4 costs $3/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between xAI: Grok 4 and OpenAI o3
xAI: Grok 4 is made by xai while OpenAI o3 is from openai. On pricing, xAI: Grok 4 costs $3/M input tokens vs $10/M for OpenAI o3.
API pricing
Per 1M tokens
xAI: Grok 4
Input
$3.00
3.3× cheaper
Output
$15.00
2.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
xAI: Grok 4 is cheaper on both — 3.3× input, 2.7× output
Our Verdict
xAI: Grok 4
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
58%
xAI: Grok 4 uses 7.0x more emoji
xAI: Grok 4
OpenAI o3
53%Vocabulary68%
18wSentence Length14w
0.67Hedging0.26
2.7Bold0.7
2.7Lists3.0
0.07Emoji0.00
0.86Headings0.38
0.04Transitions0.12
Based on 21 + 16 text responses
FAQ
