Grok 3 vs o3 Mini
Compare Grok 3 by xAI against o3 Mini by OpenAI, context windows of 128K vs 64K, tested across 53 shared challenges. Updated May 2026.
Which is better, Grok 3 or o3 Mini?
Grok 3 and o3 Mini are both competitive models. Context windows: 128K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between Grok 3 and o3 Mini
Grok 3 is made by xai while o3 Mini is from openai. Grok 3 has a 128K token context window compared to o3 Mini's 64K.
API pricing
Per 1M tokens
Grok 3
Input
—
Output
—
o3 Mini
Input
$1.10
Output
$4.40
Our Verdict
Grok 3
o3 MiniRunner-up
No community votes yet. On paper, Grok 3 has the edge — bigger model tier, newer, bigger context window.
Slight edge
Writing DNA
Style Comparison
Similarity
62%
Grok 3 uses 3.9x more emoji
Grok 3
o3 Mini
49%Vocabulary65%
18wSentence Length17w
0.94Hedging0.74
2.5Bold3.9
3.0Lists1.7
0.04Emoji0.00
0.65Headings0.47
0.08Transitions0.38
Based on 17 + 12 text responses
FAQ
