Adopted faster than any
technology in history.

The personal computer took twenty-two years to reach seventy percent of US households. Generative AI reached fifty-four percent of US adults aged eighteen to sixty-four 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

The milestone figures are sourced. The animated lines below are normalized interpolation between milestones, not annual historical observations.

Normalized US Adoption Paths · Years from mass-market launch

Race the adoption milestones.

NoteGenerative AI stops at the measured August 2025 endpoint: 54.6% of US adults aged 18-64, per the St. Louis Fed. Other line segments are normalized interpolation for comparison, not observed annual readings.

§2.1Mass. Fast.

5 days

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

Source · Sam Altman · Dec 2022

54.6%

of US adults aged 18-64 used generative AI by August 2025, faster than PCs or the internet at the same stage.

Source · St. Louis Fed · Nov 2025

900M+

weekly active ChatGPT users, with more than 50 million consumer subscribers.

Source · OpenAI · May 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); OpenAI usage disclosures (May 2026). Historical milestones use Our World in Data and US Census CPS data.