Which Design Doc Did a Human Write?
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An author spent 16 hours writing a design doc by hand, then generated two more using Claude Opus and GPT-5 (Codex), and challenged readers to identify the human-written version. Just under 50% of readers correctly identified the human version. Key human giveaways included personal opinions, anecdotal experience, unusual
Table of contents
The answer 🔗Which version did readers think was AI? 🔗What made me obviously human 🔗What made the AI obviously AI? 🔗What made readers guess incorrectly? 🔗Images were a dead giveaway 🔗My reviews of the other docs 🔗Implementation now in progress 🔗Sort: