https://t.co/XlZc6miEid

May put Codex in more places you actually work. Here’s what changed for developers building with OpenAI.

We had 5/5, 5 million Codex users, and a very full commit history:

OpenAI Developers

@OpenAIDevs

It’s 5/5. What are you building with GPT-5.5?

Denise Holland Dresser

@dhdresser

We hit 5M Codex users. Pretty perfect way to kick off the week!

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Tibo

@thsottiaux

May 31

Five million users would agree. Resetting the limits tomorrow morning to celebrate. Time to go /fast x.com/blader/status/…

Tibo

@thsottiaux

Five million users would agree. Resetting the limits tomorrow morning to celebrate. Time to go /fast

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Siqi Chen

@blader

May 31

nothing like switching to claude for a few days to try out a new model and going back to codex xhigh to remind you how much better 5.5 is right now it's really not close

Codex pets entered the chat:

OpenAI Developers

@OpenAIDevs

Pets. Now in Codex. Use /pet to wake your pet.

OpenAI Developers

@OpenAIDevs

Your pet can keep an eye on what Codex is doing while you keep working:

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Kath Korevec

@simpsoka

May 1

Something a little fun for Friday! This was super fun to work on with @Rjdleee. Pets adds a little more whimsy to Codex, but it is also useful. It gives a bit more info about what Codex is doing while staying in the periphery. I couldn't help myself, had to make a Max x.com/OpenAIDevs/sta…

The media could not be played.

You hatched your own:

Kath Korevec

@simpsoka

I made my pet into a pet. Meet Mogwai.

shiv

@mavihsk

Replying to

meet my voldy.. i am just one "error " away from "Avada Kedavra!"

Natalie

@livinoffwater

Replying to

Cute pets need a physical cute body

Kevin Kern

@kevinkern

Replying to

meet my adopted punch the monkey

You can now keep Codex moving from the ChatGPT mobile app:

OpenAI Developers

@OpenAIDevs

Step away from your laptop. Keep building with Codex on your phone. Codex keeps working on your computer, with your files and project context still in place. Pocket-sized access. Full Codex working state.

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OpenAI

@OpenAI

May 14

You've been asking for this one... Now in preview: Codex in the ChatGPT mobile app. Start new work, review outputs, steer execution, and approve next steps, all from the ChatGPT mobile app. Codex will keep running on your laptop, Mac mini, or devbox.

OpenAI Developers

@OpenAIDevs

Your laptop can stay home. Work with Codex from the ChatGPT mobile app, answer questions on the go, and pick up the same thread later from your computer.

Your Mac can keep running Codex while you step away:

OpenAI Developers

@OpenAIDevs

Codex anywhere and everywhere, all the time. Now your Mac doesn’t have to be unlocked for Codex to use your computer. From your phone, Codex can securely use apps on your Mac, even when the screen is off and locked. developers.openai.com/codex/app/comp

OpenAI Developers

@OpenAIDevs

Your Mac can hold down the fort while you work from your phone. Enable remote connection in the Codex desktop app, then turn on “Keep this Mac awake.” When your Mac is powered on and plugged in, Codex can keep running there while you work from the ChatGPT mobile app.

Computer use lets Codex work across your Mac apps:

OpenAI Developers

@OpenAIDevs

Computer use lets Codex work across your apps without taking over your Mac.

talks with

about what changes when agents can click, type, and keep working in the background.

Codex can test web apps, gather context from your tabs, and use DevTools with the Chrome plugin:

OpenAI Developers

@OpenAIDevs

Codex can now take on more of your browser dev work. With the new Chrome plugin in the Codex app, it can test web apps, gather context across tabs, use web DevTools efficiently in parallel, and keep results organized without taking over your browser.

⌘+⌘ now sends screenshots straight into a Codex thread:

OpenAI Developers

@OpenAIDevs

It’s Codex Thursday, and yes, we have updates for you. First up: Appshots, a new way to bring the context of what you’re working on into Codex. On your Mac, press Command-Command to attach your app window to a Codex thread. Codex gets both a screenshot and text from the window,

Windows builders, computer use is in your developer loop now:

OpenAI Developers

@OpenAIDevs

Codex now supports more of the Windows developer loop. With Computer use on Windows, Codex can test apps, debug flows, and review work where your project context lives. Codex in the ChatGPT mobile app lets you connect to Windows machines and keep steering from your phone.

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OpenAI

@OpenAI

May 29

Windows users, this one’s for you. Computer use now works on Windows, so Codex can take action on your Windows computer. And with Windows support for Codex in the ChatGPT mobile app, you can start, review, and steer tasks on the go while work continues on your Windows machine.

The Codex loop got easier to customize, automate, and recognize:

OpenAI Developers

@OpenAIDevs

Codex is getting easier to automate and customize around your code. Hooks customize the Codex loop with scripts that run at key points in a task: • Run validators before or after work • Scan prompts for secrets • Log conversations to internal systems • Create memories or

OpenAI Developers

@OpenAIDevs

2 quality-of-life improvements for developers working with Codex today: Codex background agents now have stable pixel identicons. When the same agent shows up across tabs, mentions, transcripts, and the thread panel, it’s easier to recognize at a glance.

The Realtime API got new models for voice agents, live translation, and transcription:

OpenAI Developers

@OpenAIDevs

Voice agents are getting more capable. Here’s what’s new: • GPT-Realtime-2 for voice agents that reason and take action • GPT-Realtime-Translate enabling translation from 70 input languages into 13 output languages • GPT-Realtime-Whisper, making transcription even faster

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OpenAI

@OpenAI

May 7

Introducing GPT-Realtime-2 in the API: our most intelligent voice model yet, bringing GPT-5-class reasoning to voice agents. Voice agents are now real-time collaborators that can listen, reason, and solve complex problems as conversations unfold. Now available in the API

We tested Realtime-2 in voice-controlled CRM and standup workflows:

OpenAI Developers

@OpenAIDevs

Here’s how you can integrate GPT-Realtime-2 to bring voice control to a CRM workflow.

OpenAI Developers

@OpenAIDevs

What if your team gave standup updates, and GPT-Realtime-2 moved the tickets?

Building with Realtime-2? Start with the prompting guide:

OpenAI Developers

@OpenAIDevs

Building voice applications with GPT-Realtime-2? Our new prompting guide covers how to tune reasoning effort, use preambles, design tool behavior, handle unclear audio, capture exact entities, and maintain state in longer sessions.

The Agents SDK got TypeScript support, sandbox agents, and an open-source harness:

OpenAI Developers

@OpenAIDevs

The updated Agents SDK is now available in TypeScript, with support for sandbox agents and an open-source harness built in.

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OpenAI Developers

@OpenAIDevs

Apr 15

Build long-running agents with more control over agent execution. New capabilities in the Agents SDK: • Run agents in controlled sandboxes • Inspect and customize the open-source harness • Control when memories are created and where they’re stored

Private MCP servers can now connect to OpenAI products over outbound HTTPS:

OpenAI Developers

@OpenAIDevs

Private MCP servers OpenAI products Your team can keep MCP servers inside your network while ChatGPT, Codex, and the Responses API connect through outbound-only HTTPS. developers.openai.com/api/docs/guide

For builders who want the under-the-hood details behind OpenAI products, here are a few deep dives from our team:

OpenAI Developers

@OpenAIDevs

Voice AI only feels natural when conversation keeps pace with speech. Here’s how we rebuilt our WebRTC stack with a thin relay and stateful transceiver to keep real-time media fast for ChatGPT voice, the Realtime API, and more.

OpenAI Developers

@OpenAIDevs

Behind the build of self-improving tax agents with Codex We co-built Tax AI with

around tax prep workflows so when reviewers fix any errors, Codex can trace the failure, improve the system, and test the change before it ships.

OpenAI Developers

@OpenAIDevs

To bring Codex to Windows, we had to answer a hard question: how do you let coding agents stay useful without forcing developers to choose between constant approval prompts and full machine access? Here’s how we built the Windows sandbox for Codex:

That’s the May commit history. Follow

on X to stay up to date.