TBPN · Sep 29, 2026
With Andrew Ambrosino, who leads OpenAI's Codex desktop app and Space teams
OpenAI rewrote chatgpt.com from scratch in the last five weeks to run on the same code as the Codex app, Andrew Ambrosino said, one of two product mergers he called "a little bit under the radar" on a day full of bigger announcements.
Ambrosino, who has led the Codex desktop team since the app first shipped and has since taken on OpenAI's new Space product too, made his first appearance on TBPN to walk through what he called a series of mergers between Codex and ChatGPT.
"I mean, this entire DevDay is planned using coding agents."
Andrew Ambrosino, who leads OpenAI's Codex desktop app and Space teams, spoke with TBPN's hosts at DevDay about consolidating Codex and ChatGPT and the new Space product.
The full interview is covered here so you can skip it.
Here are the 5 takeaways that matter.
Key Takeaways
chatgpt.com was rewritten in the last five weeks to run on the same code as the Codex desktop app
ChatGPT now works in the cloud by default, with access back to a user's local machine, alongside the same-day launch of Codex Cloud
Space is meant to be OpenAI's entry into a "multiplayer, more collaborative era" for Codex and ChatGPT together
"Time is money, save both" is how Ambrosino sums up OpenAI's pitch for its faster, pricier Ultrafast model tier
This entire DevDay was planned using coding agents, he said, even where the agents don't look like coding agents anymore
1. chatgpt.com in 5 Weeks
John Coogan asked Ambrosino to describe what he called "the merge" — the process of unifying Codex's agentic capabilities with ChatGPT. Ambrosino said two mergers shipped that day with little fanfare.
"We had this great app with Codex." — Andrew Ambrosino
"We had ChatGPT that served a billion users." — Andrew Ambrosino
He said OpenAI rebuilt chatgpt.com entirely over five weeks to become the same product as the Codex desktop app, explaining a since-deleted tweet in which he said he was "going dark" for six weeks.
"Cool. And then the second merge that we've done is now by default, ChatGPT work on the desktop." — Andrew Ambrosino
