Longitudinal Human–AI Collaboration Archive
PDI holds a naturalistic, non-synthetic archive spanning 3.5+ years (since April 2023) of continuous interaction between one human and ChatGPT across multiple model generations — developed through everyday creative and operational work, not scripted benchmark exercises.
Ongoing archive. Counts are from the September 2026 ChatGPT export and are updated with each new export. Methodology available on request.
Style analysis against public ChatGPT data shows something rarely documented: a distinct, user-shaped collaborative persona. Rather than answering like a generic assistant, it works like a coworker, using “we,” “us” and “let’s” nearly three times as often as ordinary ChatGPT. This consistent voice formed through use in late 2024 and has remained identifiable in 74% to 99% of its replies across nine model versions, from GPT-4o through GPT-5.6, compared with just 4% to 17% for ordinary ChatGPT. The archive now continues into GPT-6.x.
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