GPT-5 Pro
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Pro vs o3 Mini
Compare GPT-5 Pro and o3 Mini, both from OpenAI, context windows of 400K vs 64K, tested across 42 shared challenges. Updated April 2026.
Which is better, GPT-5 Pro or o3 Mini?
GPT-5 Pro and o3 Mini are both competitive models. GPT-5 Pro costs $15/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 Pro and o3 Mini
GPT-5 Pro is made by openai while o3 Mini is from openai. GPT-5 Pro has a 400K token context window compared to o3 Mini's 64K. On pricing, GPT-5 Pro costs $15/M input tokens vs $1.1/M for o3 Mini.
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
GPT-5 Pro
o3 Mini
65%Vocabulary65%
15wSentence Length17w
0.32Hedging0.74
0.0Bold3.9
2.9Lists1.7
0.00Emoji0.00
0.00Headings0.47
0.01Transitions0.38
Based on 11 + 12 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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