GPT-4o (Omni) vs o3 Mini
Compare GPT-4o (Omni) and o3 Mini, both from OpenAI, context windows of 128K vs 64K, tested across 54 shared challenges. Updated May 2026.
Which is better, GPT-4o (Omni) or o3 Mini?
GPT-4o (Omni) and o3 Mini are both competitive models. GPT-4o (Omni) costs $2.5/M input tokens vs $1.1/M for o3 Mini. Context windows: 128K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and o3 Mini
GPT-4o (Omni) is made by openai while o3 Mini is from openai. GPT-4o (Omni) has a 128K token context window compared to o3 Mini's 64K. On pricing, GPT-4o (Omni) costs $2.5/M input tokens vs $1.1/M for o3 Mini.
API pricing
Per 1M tokens
GPT-4o (Omni)
Input
$2.50
Output
$10.00
o3 Mini
Input
$1.10
2.3× cheaper
Output
$4.40
2.3× cheaper
o3 Mini is cheaper on both — 2.3× input, 2.3× output
Our Verdict
GPT-4o (Omni)
o3 MiniRunner-up
No community votes yet. On paper, GPT-4o (Omni) has the edge — bigger model tier, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
62%
GPT-4o (Omni) uses 2.5x more emoji
GPT-4o (Omni)
o3 Mini
54%Vocabulary65%
18wSentence Length17w
0.72Hedging0.74
7.3Bold3.9
5.6Lists1.7
0.03Emoji0.00
1.40Headings0.47
0.26Transitions0.38
Based on 24 + 12 text responses
FAQ
