This week’s Codex headlines don’t agree with each other. The New Stack put the number at 8 million users, KuCoin and Crypto Briefing ran 6 million days earlier, and aggregator roundups landed anywhere in between. The figures all trace to one person’s X account — and most of the headlines changed what he said on the way to print.
What OpenAI actually said, post by post
Tibo Sottiaux, OpenAI’s engineering lead for Codex, posted three milestones in three days. The 6 million mark is dated July 12 by The New Stack and KuCoin, both citing Sottiaux’s launch-week update — the same post that temporarily removed the 5-hour usage limit on Plus, Business, and Pro plans. On July 13 he posted “Thank you to the 7M active users who are now using Codex and ChatGPT Work”, adding a banked reset to every account. On July 14 at 3:34 p.m. ET came “We have reached 8M active users across Codex and ChatGPT Work”, with another full usage-limit reset. The driver is GPT-5.6, which launched July 9 — Sottiaux wrote on July 11 that OpenAI had “never seen traffic increase so quickly”.
Why 8 million is not last month’s 5 million plus three
Every July figure counts “active users across Codex and ChatGPT Work” — two products combined, with no weekly qualifier and no published definition of active. OpenAI’s last Codex-only figure differs on both axes: more than 5 million weekly users, announced June 2 on the company blog, which we covered at the time. ChatGPT Work also joined the bundle the week GPT-5.6 shipped, when Codex merged into the ChatGPT desktop app — so the combined base widened by definition at the same moment it grew. Setting 8 million against 5 million and reading 60 percent growth in six weeks compares two series that measure different things.
How the headlines drifted
The New Stack’s headline reads “OpenAI hits 8 million Codex users”, dropping ChatGPT Work entirely. KuCoin’s flash rendered July 12 as “Codex users exceed 6 million”, with the combined metric restored only in the body text. Crypto Briefing’s July 14 piece quoted Sottiaux accurately under a Codex-only headline, a day after running a 6 million headline over a body that cited 5 million weekly. Some roundups also describe the new figures as “weekly” — a word that appears in none of the July posts.
The verified series
OpenAI’s blog has published exactly one Codex-only weekly figure this quarter: 5 million-plus on June 2. The July numbers are genuine OpenAI statements too — vendor-reported, quoted exactly above — but they measure a broader, differently defined thing. The reset mechanics show the switch: Sam Altman’s April pledge promised a limit reset at every additional million weekly Codex users up to 10 million, and the July resets arrived keyed to the combined count instead. Our stats page keeps the two series separate, with a source and date on every figure.