How fast is ChatGPT growing?

Between OpenAI's Feb 27 and Sep 29, 2026 statements: 300 million additional weekly users in 214 days — about 1.4 million a day, or 16 every second, measured between those two statements.

When did it pass 1 billion?

Interpolating between the two 2026 statements puts the billion crossing around May 9, 2026. OpenAI did not announce the crossing itself.

Are these monthly or weekly users?

Weekly, in every figure shown, as OpenAI stated them.

BRAIAIN Society Last updated: 2026-10-20

How many people use ChatGPT?

Name: ChatGPT weekly user statements, 2023–2026
Creator: BRAIAIN
Published: 2026-10-20
License: https://creativecommons.org/licenses/by/4.0/

OpenAI's most recent statement puts ChatGPT at 1.2 billion weekly users (Sep 29, 2026, repeated Oct 7). The company said 900 million on Feb 27, 2026 — growth of about 1.4 million users a day between the two statements. The timeline below lists every official figure back to 100 million weekly users in November 2023, with weaker secondhand points labeled.

Weekly users, millions, scale 0–1,200. Filled points: first-party OpenAI statements; hollow: secondhand reports. Not a continuous series — statements only. Chart drawn from the table below.

The data

date	weekly users millions	provenance
2023-11-06	100	first-party event (DevDay)
2024-08-29	200	press citing OpenAI spokesperson (weaker)
2024-12-04	300	first-party event (DealBook)
2025-02-20	400	press (weaker)
2025-03-31	500	staff X post via press (weaker)
2025-10-06	800	first-party event (DevDay)
2026-02-27	900	OpenAI blog
2026-09-29	1200	OpenAI blog (DevDay recap)

Download: CSV · JSON — compiled data CC BY 4.0; underlying sources keep their own terms.

Method & caveats

Only figures OpenAI itself stated (keynotes, blog posts) or direct reports of such statements are included; each point carries a provenance label and weaker points are marked. The series is a set of dated statements, not a measured curve — interpolation between points is labeled wherever used. All figures are weekly users as OpenAI stated them.

Sources

Questions

How fast is ChatGPT growing?: Between OpenAI's Feb 27 and Sep 29, 2026 statements: 300 million additional weekly users in 214 days — about 1.4 million a day, or 16 every second, measured between those two statements.
When did it pass 1 billion?: Interpolating between the two 2026 statements puts the billion crossing around May 9, 2026. OpenAI did not announce the crossing itself.
Are these monthly or weekly users?: Weekly, in every figure shown, as OpenAI stated them.

Cite this

BRAIAIN. "How many people use ChatGPT?" www.braiain.com/chatgpt-users.html, updated 2026-10-20. Original sources as listed above.

Part of BRAIAIN — the AI buildout, measured. Every figure carries its source and date; the full rules are in the methodology. Corrections: see the contact note there. © 2026 BRAIAIN, a dnilgis project.