OpenAI Codex CLI 0.129.0 Released with Modal Vim Editing and Chrome Extension
OpenAI
OpenAI shipped Codex CLI v0.129.0 on May 7, adding modal Vim editing in the composer, a redesigned resume/fork picker, workspace-aware /diff, and improved plugin management with workspace sharing. A Codex Chrome extension launched simultaneously, enabling the agent to run in parallel across browser tabs without taking over the browser, with DevTools access and browser-based app testing. OpenAI reported 4 million weekly active users, up 8× since the start of 2026.
Why it matters
The Chrome extension is a significant capability expansion — Codex can now operate in browser-native workflows without interrupting the user. 8× yearly growth in WAU confirms strong adoption momentum for OpenAI's coding agent.
Importance: 3/5
OpenAI; Codex Chrome extension marks expansion into browser-native agent workflows; 4M WAU at 8× annual growth rate confirmed.