Key Facts
The main thread is the July 16 desktop update: a global switcher was added between ChatGPT and Codex, Chat and Work conversations were merged into a unified "recent conversations," Projects can be accessed directly in the desktop app, and Work conversations support cross-device cloud sync; Codex still keeps a separate view, with its workflow and history unchanged. There was one follow-up each on the surrounding days: on the 15th, the Custom Instructions character limit was expanded from 1,500 to 5,000, covering Plus, Enterprise, Business, and Education users; and Codex 0.144.6, released on the 18th, refreshed the built-in instructions for GPT-5.6 Sol/Terra/Luna and corrected the three models' context-window labeling to 272,000 tokens.
A Notable Security Item
The concurrent Codex 0.144.5 strengthened dangerous-command detection—covering more forced `rm` variants and giving clearer reasons when refusing to execute. For teams connecting Codex to CI or local automation, this is a practical protection upgrade.
Impact Assessment
The direction of this round of updates is clear: OpenAI is making the desktop app a single entry point for "chat + coding + work documents," positioned squarely against the combination of the Claude Code desktop version and Cursor. For users, two things can be done right away: heavy prompt users should move their common rules into the expanded custom instructions; and developers using Codex should upgrade to 0.144.6, while confirming that their usage estimates weren't calculated against the wrong context-window labeling.
via: OpenAI official changelog (Releasebot summary, 2026-07-15/16/18); verified 2026-07-20