Codex: from no-PMF side project to 40M weekly users inside OpenAI in a year
danshipper · x · 2026-10-16
Dan Shipper's deep dive on Codex's rise: a year ago it was a struggling effort without PMF; today it runs inside the ChatGPT desktop app, Codex plus ChatGPT for Work serve 40M+ weekly users, and leader Thibault Sottiaux now runs all of OpenAI's core products (ChatGPT, Codex, API). The key: a dedicated model line trained separately from ChatGPT, built by researchers and product staff working tightly together.
Related event: Every's "How Codex Happened" Chronicles Codex's Comeback(13 posts)→
More from coding & agent
- Claude dev Felix Rieseberg's tutorial: 4 ways to be more ambitious with AI — daniel_mac8 · 2026-10-16
- Are the fastest GPU kernels now written by AI? Kernels are hyper-verifiable, argues one dev — fleetwood___ · 2026-10-16
- Anthropic lead engineer's 4-question prompt makes agents more ambitious, now a free skill — daniel_mac8 · 2026-10-16
- ChainForge dev shows 'feature map' for orchestrating subagents on large PRs — IanArawjo · 2026-10-16
- aiDotEngineer benchmarks agent orchestration pipelines, staging humans as Foreman and workers — vikvang1 · 2026-10-16
- Developer mass-produces 200 videos in hours using Claude Code + Hyperframes — mcraddock · 2026-10-16