OpenAI announces new features for Codex, including reusable cloud development environments, a refreshed Codex CLI, and a new code review experience

OpenAI introduced new capabilities for its software engineering agent Codex, making it more useful beyond a developer's laptop …

TechCrunch 2026-09-30 Sarah Perez

Context & Ripple Effects

Codex began as an API private beta that powered GitHub Copilot, then became a software-engineering agent for ChatGPT Pro, Enterprise, and Team users in 2025. OpenAI’s April 2026 desktop-app expansion added computer control, browser access, automation memory, and plugins, broadening the agent beyond code generation.

Reusable cloud environments extend that progression from a developer’s device to a persistent work surface that can carry a repository, dependencies, and scripts across sessions. The refreshed CLI and review workflow put task execution and inspection alongside that environment rather than treating them as separate tools.

First-order effects

Software teams using Codex can preserve development setup in OpenAI-hosted environments, reducing the need to recreate a local machine configuration when resuming agent work.
Codex users gain updated terminal and code-review surfaces, concentrating editing, execution, and review in the same product family.

Second-order effects

OpenAI’s Codex proposition becomes less dependent on a developer keeping a laptop available, making persistent environment state a differentiator for teams selecting an engineering agent.
Teams that standardize on Codex cloud environments may move repository setup, dependencies, and review routines into OpenAI’s workflow, raising the value of interoperability with their existing development processes.

Third-order effects

If persistent cloud environments become the default substrate for coding agents, software development tools will compete less as isolated editors or assistants and more as end-to-end delivery control planes.
The shift from the 2025 Codex agent rollout to cloud-resident work suggests that agent adoption will increasingly depend on durable execution context, not only model output quality.

The trend: AI coding products are evolving from local assistants into cloud-based agent work surfaces that retain context and execute work across devices.

Discussion

@quinnypig Corey Quinn on x
Did EVERYONE black out at the mention of “AWS?”
@openaidevs @openaidevs on x
Start a task in the cloud, then follow its progress and steer Codex from your phone or another computer, even with your laptop off. We're also bringing the familiar desktop app experience to web and mobile. [video]
@borismpower Boris Power on x
Finally, Codex is in the cloud - no need for my laptop to constantly be on. Obviously the right decision!
@openaidevs @openaidevs on x
You can finally close your laptop now and your agents will keep working. Codex cloud environments are here. Reusable environments mean less setup and faster starts, with your repo, dependencies, scripts, and settings already in place. [video]
@mweinbach Max Weinbach on x
With Codex moving to the cloud, I think part of what I wrote in my M5 Ultra report is important to reiterate. That thing has an incredible CPU, as well as GPU, and if I can delegate to it from anywhere, it has far more value than just a GPU for inference on my desk
@openai @openai on x
Codex Security Cloud is getting a major upgrade, with access to cyber-capable models through Daybreak Blue included by default. It scans entire GitHub repos, continuously reviews new commits, investigates and deduplicates findings, and prepares fixes for review - even when your l…
@openaidevs @openaidevs on x
Codex cloud environments are rolling out to Plus, Pro, Business, and Enterprise. In Business and Enterprise workspaces, you can share environments so your whole team can work from the same setup. Just select a cloud environment when you start a task, wherever you use Codex, and […
@thsottiaux Tibo on x
Decisions API, for lightning fast constrained decision making powered by Luna. Supports visual inputs, and tuned to be able to make decisions in less than a few hundreds of milliseconds end to end.
@jjacky Jacky on x
it's official “decisions” has won out - openai has chose it (been a “decisions” fan since day 0)
@wesbos Wes Bos on x
curious if this is just an API wrapped on Luna? Luna is VERY cheap, but not Jev cheap Image inputs is great though, I've had it process images for $0.001
@airesearch12 Florian S on x
It was obvious, but f*ck that happened fast. Ok, so now I'll have to benchmark it, and I'll do so pretty fast. If anyone at @OpenAI can give me early/free access, to put it on JevBench, it would be appreciated. /cc @sama
@marlene_zw Marlene Mhangami on x
New decisions API from OpenAI powered by giving Luna model a predefined set of options to choose from! Looks really good. Congrats to the Jev team for creating a new category too😉
@dejavucoder Sankalp on x
openai jev supports vision too
@brianyu8 Brian Yu on x
introducing the OpenAI Decisions API. for when you and your girlfriend need to decide where to go for dinner REALLY fast!
@iannuttall Ian Nuttall on x
OpenAI just launched the Decisions API using Luna. Jev killer?
@mvanhorn Matt Van Horn on x
What in the jev is going on? Decisions model API from @opanai?
@enunomaduro @enunomaduro on x
lol, seems like the Decisions API is coming to OpenAPI so i guess.. it's gg for Jev?
@rudrank @rudrank on x
Decisions API 👀 I am going to integrate it into something I am working with 👀
@borismpower Boris Power on x
Decisions API - almost instant responses - very good for computer interaction!
@bendee983 Ben Dickson on x
OpenAI (and probably Anthropic and DeepMind) coming after Jev with their own decision model (aka System One Model) was an obvious and predictable outcome. However, this doesn't necessarily mean that Jev will be eliminated, because: 1) It was created by one of the former crack eng…
@ccatalini Christian Catalini on x
You bring the app. OpenAI brings the intelligence. Does OpenAI also get the user traces? An interesting partnership, if your contribution is teaching your partner how to do your job. https://x.com/...
@thsottiaux Tibo on x
We are opening up our platform and you can now build full native apps with plugin extensions, and ship them right in ChatGPT. We have over 1.2B weekly users and will surface relevant plugins right in the conversations.
@emollick Ethan Mollick on x
It does feel like every year OpenAI releases a variation on the same third-party ecosystem only to semi-abandon it: Plugins in 2023, GPTs and the GPT Store in 2023-2024, Apps in 2025, and now Plugins (same name, different thing than before) in 2026.
@tuhinone Tuhin Srivastava on x
Baseten is now available as one of the first open-model inference providers in the @OpenAI B2B Marketplace. Enterprise customers can use existing OpenAI commitments for open models served by Baseten (Codex or the Responses API). Run what makes sense for your enterprise—open, clos…
@dannieherz Dannie Herzberg on x
Baseten is one of the first open model inference providers in OpenAI's new B2B marketplace. This is a huge vote of confidence in open models and in Baseten, and another step toward our mission to help every company own its intelligence. Grateful to the @OpenAI team for being grea…
@philipkiely Philip Kiely on x
Enterprise teams can now use open models like GLM-5.3 Flash and Kimi K3 natively in Codex and count spend against their OpenAI commit.
@gergelyorosz Gergely Orosz on x
It's moves like this OpenAI feels to be pulling ahead of Anthropic. Anthropic is closed everything: closed source Claude Code, no you cannot use other models with CC, and so on. OpenAI: Codex is open source, you can use other models; oh let's make it dead simple to use GLM-5.3:
@downingark Frank Downing on x
OpenAI is betting so hard on the agent layer that they're willing to serve you open models through their surfaces if you want. For general use, OpenAI's models are already extremely competitive on an intelligence per dollar basis, so I don't think this will cannibalize sales too …
@oneill_c Charlie O'Neill on x
The future is both open and closed, and so good to see @OpenAI betting on this with us. Baseten is will be the exclusive open-source inference provider with OpenAI, meaning you can use frontier and optimised open models with existing OpenAI commitments and spend, including a nati…
@apoorv03 Apoorv Agrawal on x
OpenAI serving open-source models through Baseten is a big deal. They are embracing open source. Until now, OpenAI's pitch was “use our models.” Now it is “commit your annual AI budget to us
@thsottiaux Tibo on x
Proud of this. Open is the way.
@scottbelsky Scott Belsky on x
meaningful partnership and integration for the @baseten team - congrats, and a now lot of happy builders...
@astuyve AJ Stuyvenberg on x
OpenAI's marketplace is the biggest announcement from the day. You can now buy open-weight model inference from Baseten through OpenAI's responses API (and codex):
Amir Haghighat Amir Haghighat on linkedin
Two months ago I said the easiest way to use open models in Codex was ‘brew install baseten-switch’. …
Philip Kiely Philip Kiely on linkedin
Huge news from OpenAI DevDay 2026. — Baseten has joined the OpenAI Marketplace. Now, enterprise teams can spend their OpenAI commits on Baseten inference …
@minchoi Min Choi on x
RIP Notion ChatGPT:
@thsottiaux Tibo on x
Announcing ChatGPT Space, a collection of new collaborative experiences right in ChatGPT. Edit rich notes with live visualizations together with others and your dots. Whether it's a TODO list to delegate, a product plan or meeting notes. Working with others and your agents is sea…
@testingcatalog @testingcatalog on x
OpenAI introduced ChatGPT Space, a new collaborative workspace for humans and AI Agents. > “In Space, you can work with pages—a new kind of interactive document with charts, images, checklists, and dashboards. >
@firstadopter Tae Kim on x
OpenAI announces ChatGPT Space. Looks like they are going after office productivity (competes with Microsoft and Google)
@danshipper Dan Shipper on x
BREAKING: @OpenAI just launched Space, an agent-native office suite. It's a Google Drive-like place inside ChatGPT where you, your Dots, and your team can organize and work on files together. OpenAI is also introducing native apps for documents, spreadsheets, and slides that you …
@chatgpt @chatgpt on x
ChatGPT Space is your new home for creating and collaborating with your team and AI. In Space, you can work with pages—a new kind of interactive document with charts, images, checklists, and dashboards. ChatGPT can build pages for you based on the work you need to get done or the…
@cgtwts @cgtwts on x
Holy shit, they just killed notion.
@sama Sam Altman on x
DevDay livestream in 2 hours. We built some great stuff for you!
@dilmerv @dilmerv on x
Live demos are hard! Huge respect to her for having the guts to put herself out there. That alone says a lot about how much she cares about her work! She handled the challenges well and kept her cool throughout the demo. We should bring back more live demos! Seeing OpenAI, S…
@adalluch Ada Lluch on x
Imagine having so little creativity that your entire brand is a cheap copy of your competitor. It really must suck to be Sam.
@kimmonismus @kimmonismus on x
30 minutes to go. Obviously I'll tweet live
@epictrades1 @epictrades1 on x
$META OPENAI event was suboptimal
@synthwavedd Leo on x
Jesus Christ someone tell OpenAI to stop doing these live demos this is extremely embarassing
@anandragn Anand on x
1. OpenAI's demo glitches got more attention. Meta's new announcement got more attention. 2. OpenAI Dots requires OpenAI Pro, starting at $100/month. Muse connects to Shopify, QuickBooks and Stripe for small businesses and has a free tier. 3. OpenAI asking you to subscribe first.…
@kawzinvests @kawzinvests on x
Muse > Dot
@vipinxtwt Vipin on x
Two things went wrong during the @OpenAI #devday demos: • During the dot demo, the dot wasn't responding. • In another demo where Codex was being used, voice chat wasn't working at all. And now I can't even find these clips on the official stream anymore. 👀 But I recorded them li…
@maksim_p_m Maksim P. Martynyuk on x
OpenAI is going to send $META to $1000
r/accelerate r on reddit
OpenAI Dev Day Recap - Dots, Sol 6.1, Spaces, and $500 plan
r/OpenAI r on reddit
Live from OpenAI DevDay 2026: Keynote - DISCUSSION
@illscience Anish Acharya on x
Oh man there is so much in the OAI launches this morning, early reactions: - OAI leaning into its strengths around model breadth (full duplex voice / computer use), compute (ultrafast / decisions / price cuts), and knowledge work (spaces / dots) - Spaces is an impressive effort t…
@vraserx @vraserx on x
Sam says they've been cooking. Please let it be AGI and not 20 API updates. 😭
@munster_gene Gene Munster on x
OpenAI dev day kicks off. Bottom line: This personalized AI thing is going ballistic. Altman announces dots, a bot that competes with Muse, Siri, Grok Bot, Poke. He calls it the “real version of AI that we have always wanted”.
@openai @openai on x
Our biggest DevDay ever, don't be late. https://openai.com/live
@tokengremlin @tokengremlin on x
I read through basically everything OpenAI announced at DevDay so you don't have to: → GPT-6.1 Sol is here, better at coding, computer use and agentic work, while staying much cheaper than Astra. → Astra Ultrafast, basically Astra on steroids. Much faster in ChatGPT Work, Codex a…
@ajambrosino Andrew Ambrosino on x
NEW TODAY: - Dots - Space - GPT-6.1 Sol - Ultrafast - Pro 500 - Codex cloud (2.0!) - Plugin Extensions - Code Review - and much more!
@binarybits Timothy B. Lee on x
I'm at OpenAI DevDay today and it's really striking how little emphasis there seems to be on safety and security here. I'm not sure Sam mentioned it once in his keynote this morning. The agenda appears to have one security-related session out of 17.
@lorak Lora Kolodny on bluesky
it's openai dev day... let's see how this goes. www.cnbc.com/2026/09/29/o...

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