GPT-5 Pro
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Pro vs o1
Compare GPT-5 Pro and o1, both from OpenAI, context windows of 400K vs 128K, tested across 42 shared challenges. Updated April 2026.
Which is better, GPT-5 Pro or o1?
GPT-5 Pro and o1 are both competitive models. GPT-5 Pro costs $15/M input tokens vs $15/M for o1. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5 Pro and o1
GPT-5 Pro is made by openai while o1 is from openai. GPT-5 Pro has a 400K token context window compared to o1's 128K. On pricing, GPT-5 Pro costs $15/M input tokens vs $15/M for o1.
Our Verdict
GPT-5 Pro
o1Runner-up
No community votes yet. On paper, GPT-5 Pro has the edge — bigger model tier, newer, bigger context window.
Slight edge
Writing DNA
Style Comparison
Similarity
100%
o1 uses 503.7x more bold
GPT-5 Pro
o1
65%Vocabulary64%
15wSentence Length16w
0.32Hedging0.76
0.0Bold5.0
2.9Lists2.6
0.00Emoji0.00
0.00Headings0.44
0.01Transitions0.40
Based on 11 + 13 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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