GPT-5 vs o3 Mini
Compare GPT-5 and o3 Mini, both from OpenAI, context windows of 400K vs 64K, tested across 52 shared challenges. Updated May 2026.
Which is better, GPT-5 or o3 Mini?
GPT-5 and o3 Mini are both competitive models. GPT-5 costs $1.25/M input tokens vs $1.1/M for o3 Mini. Context windows: 400K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5 and o3 Mini
GPT-5 is made by openai while o3 Mini is from openai. GPT-5 has a 400K token context window compared to o3 Mini's 64K. On pricing, GPT-5 costs $1.25/M input tokens vs $1.1/M for o3 Mini.
API pricing
Per 1M tokens
GPT-5
Input
$1.25
Output
$10.00
o3 Mini
Input
$1.10
1.1× cheaper
Output
$4.40
2.3× cheaper
o3 Mini is cheaper on both — 1.1× input, 2.3× output
Our Verdict
GPT-5
o3 MiniRunner-up
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, newer, bigger context window.
Slight edge
Writing DNA
Style Comparison
Similarity
49%
o3 Mini uses 20.7x more bold
GPT-5
o3 Mini
65%Vocabulary65%
13wSentence Length17w
0.20Hedging0.74
0.2Bold3.9
4.6Lists1.7
0.00Emoji0.00
0.16Headings0.47
0.03Transitions0.38
Based on 16 + 12 text responses
FAQ
