ChatGPT reached an estimated 100 million monthly users in two months.
The Claim
ChatGPT's growth to 100 million monthly users within two months was the fastest adoption of any consumer application in history.
NOT BS
TOTAL BS
MOSTLY BS — Verdict: Mostly False
Verified by Lenz · Sep 7, 2026
The Short Version
ChatGPT did reach an estimated 100 million monthly active users roughly two months after launch and was considered the fastest-growing consumer application at that time. The enduring historical superlative is outdated because Threads later reached 100 million registered users in five days. Those measurements are not perfectly equivalent, but the claim supplies no qualification preserving ChatGPT’s former record.
Caveats
The 100 million figure was a third-party estimate, not a confirmed OpenAI user count.
ChatGPT held the widely reported adoption record in January 2023, not indefinitely.
Comparisons with Threads mix monthly active users with registered-user or signup counts.