o3 Mini
Nothing here. The model returned empty. We stared at it for a while.
o3 Mini vs GPT-5 Pro
Compare o3 Mini and GPT-5 Pro, both from OpenAI, context windows of 64K vs 400K, tested across 42 shared challenges. Updated April 2026.
Which is better, o3 Mini or GPT-5 Pro?
o3 Mini and GPT-5 Pro are both competitive models. o3 Mini costs $1.1/M input tokens vs $15/M for GPT-5 Pro. Context windows: 64K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between o3 Mini and GPT-5 Pro
o3 Mini is made by openai while GPT-5 Pro is from openai. o3 Mini has a 64K token context window compared to GPT-5 Pro's 400K. On pricing, o3 Mini costs $1.1/M input tokens vs $15/M for GPT-5 Pro.
Our Verdict
GPT-5 Pro
o3 MiniRunner-up
No community votes yet. On paper, GPT-5 Pro has the edge — bigger model tier, newer, bigger context window.
o3 Mini is 27x cheaper per token — worth considering if cost matters.
Slight edge
Writing DNA
Style Comparison
Similarity
99%
o3 Mini uses 390.2x more bold
o3 Mini
GPT-5 Pro
65%Vocabulary65%
17wSentence Length15w
0.74Hedging0.32
3.9Bold0.0
1.7Lists2.9
0.00Emoji0.00
0.47Headings0.00
0.38Transitions0.01
Based on 12 + 11 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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FAQ