Adopted faster than any
technology in history.

The personal computer took twenty-two years to reach seventy percent of US households. ChatGPT crossed fifty-four percent of US adults in thirty-three months.

A joint working paper from economists at the St. Louis Fed, Vanderbilt, and Harvard compared generative-AI adoption to every consumer technology in the modern record. Their conclusion, stated without hedging: “relative to the introduction of the first mass-market product, genAI has been adopted at a faster pace than both PCs and the internet.”

Years each technology needed to reach 40% of US adults.

Personal Computer

17yrs

Internet

4yrs

Smartphone

6yrs

Generative AI

2yrs

Each figure is the time to reach 40% of US adults (or households, for electricity and the PC) at the time — not back-cast against today's population. Sources normalize to the contemporaneous US adult population.

US Adoption S-Curves · Years from mass-market launch

Race the technology curves.

NoteGenerative AI series stops at the last measured data point (Aug 2025 · 54.6% per St. Louis Fed / NBER w32966). No projection beyond measured data.

§2.1Mass. Fast.

5 days

For ChatGPT to reach one million users. Netflix took 1,277. Twitter took 730.

Source · Sam Altman, Dec 5 2022

54.6%

of US adults aged 18–64 using generative AI as of August 2025 — faster than PC or internet at equivalent points.

Source · Bick, Blandin & Deming · St. Louis Fed / NBER w32966

900M

Weekly active ChatGPT users as of February 2026, with approximately 50 million paying subscribers.

Source · OpenAI · TechCrunch, Feb 27 2026

Primary sources: Bick (St. Louis Fed), Blandin (Vanderbilt), Deming (Harvard), “The Rapid Adoption of Generative AI,” NBER Working Paper 32966; St. Louis Fed “State of Generative AI Adoption” (Nov 2025 update, methodology revision); Pew Research (Jun 25 2025); McKinsey Global Survey on AI (Nov 2025 edition). Historical adoption curves from Our World in Data and the US Census CPS.