Every's Deep Dive: How Codex Rose from Side Project to 40M Weekly Users and Absorbed ChatGPT

Every editor-in-chief Dan Shipper published a long-form report on October 15–16, "How Codex Happened," described as "one of the most underrated stories in tech history." Based on firsthand interviews and the author's own experience, it reconstructs how OpenAI fell behind in the AI coding race and then turned things around with Codex.

Confirmed

• A year ago, Codex was a fringe project tucked in a corner of OpenAI; its cloud product failed to find PMF and the team essentially started over from scratch.
• In less than 12 months, Codex surpassed 40 million weekly active users and internally "swallowed" the ChatGPT desktop app.
• Codex's lead now runs all of OpenAI's core products.
• The article is Every subscription content; the author also runs Ship 30 for 30.

Why it matters

• The report offers an insider's view of the comeback of OpenAI's coding product line, an important primary source for understanding how OpenAI's product landscape has evolved (the fusion of coding capabilities with ChatGPT).
• Codex's path from side project to core business is a useful reference for watching the competitive dynamics of the AI coding tool market (the ebb and flow between OpenAI and rivals).

Note: multiple posts were reposts and retellings of the same article; this summary keeps only one copy of the information.

2026-10-15 ~ 2026-10-16 · 16 related posts

Full story(2 episodes)→

• Episode 1: Every to Publish 8,000-Word Definitive History of Codex Based on Deep OpenAI Interviews(2026-10-15, 7 posts)
• Episode 2: Every's Deep Dive: How Codex Rose from Side Project to 40M Weekly Users and Absorbed ChatGPT(2026-10-15, 16 posts)

• [source] Every publishes 'How Codex Happened': inside OpenAI's coding comeback with Codex — every · 2026-10-15
• [source] How OpenAI's Codex went from failed side project to 40M weekly users in under a year — danshipper · 2026-10-16
• How Codex Happened: inside OpenAI's comeback in coding — danshipper · 2026-10-16
• Every publishes 8,000-word history of how OpenAI's Codex outmaneuvered the coding market — every · 2026-10-16
• [source] Every publishes 8,000-word Codex oral history, agent-native so your AI can dig the raw interviews — danshipper · 2026-10-16

11 near-duplicate retellings: danshipper · danshipper · every · danshipper · danshipper · danshipper · danshipper · danshipper · danshipper · every · danshipper