o3 Mini
Nothing here. The model returned empty. We stared at it for a while.
o3 Mini vs GPT-5
Compare o3 Mini and GPT-5, both from OpenAI, context windows of 64K vs 400K, tested across 47 shared challenges. Updated April 2026.
Which is better, o3 Mini or GPT-5?
o3 Mini and GPT-5 are both competitive models. o3 Mini costs $1.1/M input tokens vs $1.25/M for GPT-5. Context windows: 64K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between o3 Mini and GPT-5
o3 Mini is made by openai while GPT-5 is from openai. o3 Mini has a 64K token context window compared to GPT-5's 400K. On pricing, o3 Mini costs $1.1/M input tokens vs $1.25/M for GPT-5.
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
99%
o3 Mini uses 20.7x more bold
o3 Mini
GPT-5
65%Vocabulary65%
17wSentence Length13w
0.74Hedging0.20
3.9Bold0.2
1.7Lists4.6
0.00Emoji0.00
0.47Headings0.16
0.38Transitions0.03
Based on 12 + 16 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ