OpenAI Says Codex and ChatGPT Work Hit 40 Million Weekly Active Users

Thibault Sottiaux, an engineering lead at OpenAI, confirmed during the Day 3 event of the DevDay series updates that Codex and ChatGPT Work have reached a combined 40 million weekly active users — an all-time high. To celebrate, the company granted a credits reset to all paid accounts. The news was first relayed on October 8 by accounts including @kimmonismus and subsequently shared and commented on by numerous bloggers.

Confirmed

• Codex and ChatGPT Work reached a combined 40 million weekly active users, confirmed by OpenAI's official team at the "Day 3" launch event (per Thibault Sottiaux's DevDay series updates).
• OpenAI issued a credits reset to all paid accounts as a celebration.
• According to information relayed by haider1, Codex added 15 million active users in roughly six weeks.

Not yet confirmed

• Extrapolating from the growth trend of previous milestones, petergostev projects that if the current curve holds, weekly active users could reach around 70 million by year-end and higher levels by the end of March 2027; this is a trend estimate, not official guidance.

Why it matters

• The 40 million weekly active user mark signals a new high in the user base of OpenAI's coding products (Codex + ChatGPT Work), with remarkable growth speed (15 million added in six weeks).
• Blogger VraserX believes that although Claude Code remains the leader in coding tools, Codex will eventually surpass it at its current pace; haider1 also noted that despite OpenAI's many controversies over the past month, the data keeps growing rapidly. These, however, are personal opinions, and the landscape is far from settled.

2026-10-08 ~ 2026-10-08 · 5 related posts

• [source] Codex and ChatGPT Work hit 40M active users as OpenAI hands out banked resets — kimmonismus · 2026-10-08
• OpenAI's Codex hits 40M weekly active users, on track for ~70M by year-end — Dimillian · 2026-10-08
• Codex adds 15M active users in 6 weeks, hitting 40M across Codex and ChatGPT Work — haider1 · 2026-10-08
• Codex Hits 40M Weekly Users, VraserX Predicts It Will Overtake Claude Code Soon — VraserX · 2026-10-08

1 near-duplicate retellings: scaling01