Top
Best
New

Posted by mikeevans 15 hours ago

Codex is now in the ChatGPT mobile app(openai.com)
354 points | 173 comments
pickleRick243 7 hours ago|
(Someone deleted a comment about why you'd want a mobile Codex app. This is the answer I wrote.)

Once you've used these coding agents a lot, you develop a pretty intuitive feel for how they work, what they're capable of, what they're good at, and where their weaknesses are. Hopefully, you're already pretty familiar with the code base you're working on. Combining the two, this means you can get quite far essentially "vibe coding" (i.e. not looking at the actual code) on a new branch.

So if you have some idea or some issue you want to fix on the go, you just iterate with the agent for a bit (presumably no more than a couple hours) until the agent outputs an implementation. Here, I do claim there is some "skill" (which is a function of your codebase familiarity, general SWE ability, and facility with AI agents), and if you're good, this implementation will be halfway decent a high percentage of the time. Then when you're back at your desktop, you can review the changes carefully/do some proper testing/debugging etc. But you've saved a good chunk of time- an initial draft is already waiting for you.

weird-eye-issue 37 minutes ago||
For major new features on my SaaS this is exactly what I do on my phone/laptop sometimes over days or weeks. I never look at the code until I get a feeling that it's far enough along and then I will hop into the actual code and start manually making changes or using CC locally to make the changes iteratively over weeks until it's ready for release. In the early stages of a major new feature/product it can be counterproductive to closely monitor the AI. Of course like you said in your comment this requires very very strong knowledge of the code base and a lot of experience with using the agents in the first place. But once you can do this sort of workflow it's very powerful because you can do this in parallel with other work (just an hour or two per day over a week or two on your phone can get you to a really good first draft even on a major new feature/product. And of course I'm not saying it's ready for production that can still take weeks but that's not really the point)
nextaccountic 7 hours ago|||
But what if the code is on my laptop? Alongside the tools needed to work with it

Case in point, I have a Rust project with a target/ directory with about 10GB. Compile times from scratch takes about 10 minutes. (I do not love this)

With this mobile app I need to upload the code to the cloud, right? Or does OpenAI expects me to compile huge projects on my phone?

pickleRick243 7 hours ago|||
No, the phone connects to your local device. This isn't "codex web" on mobile. Basically you work through your desktop on your phone. So to be clear, there are security risks (you can wipe your entire desktop from your phone).
andy12_ 4 hours ago||
Not if you use Linux; app not available yet.
odiroot 2 hours ago|||
You can run Codex Desktop on Linux. It's on AUR already. Granted, just a repacked ASAR from Windows version but still does work quite well. Haven't tested connection to mobile yet but the integration with cloud environments already works.
andai 2 hours ago|||
The announcement doesn't make this very clear, but I think this talks to the Codex CLI, not the Codex App? (Or possibly both)
andy12_ 2 hours ago||
For now it appears that it talks only to the Codex App. Some users in this thread are saying that apparently the Codex CLI will support it on the next official release.
cortesoft 7 hours ago||||
Not sure about how it works with Codex now, but with Claude you can just start a terminal session of claude code with your code checked out locally on your computer, and then enable remote control which lets you control that session from your phone.

So basically, it is like you are typing on your terminal on your computer from your phone.

skybrian 7 hours ago||||
I tried Codex web. It kinda sucks and OpenAI doesn't seem to be promoting it? Look elsewhere if you want a Linux VM in the cloud. (I quite like exe.dev and they do have good mobile support.)
az226 6 hours ago||
It's beyond terrible. Like they're routing to gpt4o mini with low effort behind the scenes. Just let us pick the model and the effort.
LoganDark 7 hours ago|||
The processes you're controlling are on your computer, similarly to Claude remote control.
LoganDark 7 hours ago|||
I've been vibe-refactoring a fork of get-shit-done (a skill collection for coding agents) for about the past week. I've had to revisit the same ideas multiple times because the agent doesn't always get it right at first, but it's still so much faster than I could have been at the same work + it's already mostly working (I've been dogfooding it for a day or two now). And I have gotten by just bringing up issues I notice from the LLM's implementation comments, rather than actually inspecting the code even once so far.

(The refactor's been to support Jujutsu VCS.)

bugbuddy 3 hours ago||
> i.e. not looking at the actual code

You must be kidding me.

andai 2 hours ago|||
> There's a new kind of coding I call "vibe coding", where you fully give in to the vibes, embrace exponentials, and forget that the code even exists.

https://x.com/karpathy/status/1886192184808149383

Forgetting code exists is by definition not suitable for serious work. However, OP said in the following paragraph, that this would be a first draft, and that the code would actually be reviewed and tested properly before being integrated.

At which point it is by definition no longer vibe coding, because you do care about the code! It's just an AI assisted workflow, but now we call all of those vibe coding for some reason. (Naming things is hard!)

If vibe coding means not caring about the code, then a literal translation of the term would be "not caring about coding" coding.

magicalhippo 3 hours ago||||
What OP said works quite well for a lot of tasks, and if you've set up base instructions on coding style they (Codex, Claude) generate code accordingly.

A key point is that after the "vibe" session you should also have a lot of tests written. So they can easily refactoring the code afterwards if there are major aspects you don't like when you get back to your desktop.

scrollaway 3 hours ago||||
I find funny the trend of software engineers being shocked at the idea that someone would issue a set of instructions to a coder and not look at the code, or only glance at it.

How do you think the world has worked for the past thirty years? AI has just caught up with human skill is all.

rvz 2 hours ago|||
Unbelievable. This is the silent de-skilling of this industry.

Imagine saying that you don't need to look at the roads or have no hands on the wheel whilst driving because someone-else said that the car can 'drive' itself; therefore, no need for anyone (including taxi drivers) to learn how to drive.

Just because a machine can generate plausible looking code does not mean you don't need to look at it or not know how it works or why it doesn't work.

Alifatisk 14 hours ago||
Whats crazier is that Codex is free. I thought I had to pay to even try it out but nope, you can use the desktop app or cli for free, its apparently included in the free plan. You just have to sign in to your ChatGPT account.

Of course I am aware that the caveat here is that all my interaction is part of training, but I’m fine with that. Even Qwen Cli discontinued the free plan.

orionsbelt 10 hours ago||
First hit is free… got to get you hooked.
firesteelrain 10 hours ago|||
How much better is it than Claude? I have both but Claude sucks up so many tokens.
riddlemethat 7 hours ago|||
I stopped trying to use Claude to do anything with 4.7 because it sucks up so many tokens so quickly. I use the 4.6 model still and have switched to Codex for larger tasks. It also works better at more complex coding tasks than Claude for web apps that have python backends and typescript front ends.
stldev 8 hours ago||||
I switched some time after Anthropic bricked their models with adaptive thinking. It's a legit mystery to me how people are still using CC professionally.

Codex is far less frustrating and manages context better. It's also costing me about 1/3rd as much as Opus 4.7 on CC.

ggsp 8 hours ago||
The only way to keep using CC for me has been to stick to 4.6 1M
bobbylarrybobby 10 hours ago||||
5.5 is absolutely comparable to opus 4.7 (both on highest effort), maybe even better. It generally seems less lazy, faster, and writes code closer to what I'd write. The only downside is that for very very long tasks, it can kind of lose track of the goal. For tasks under ten minutes I'll go with codex every time.
ymolodtsov 2 hours ago|||
The main difference is in the frontend skills. GPT produces terrible design. What I do these days is ask Opus to produce an HTML mockup, then feed it to Codex.
auggierose 1 hour ago||||
I have not had problems with long goals. I let it chomp for 40 minutes on a proof in my custom theorem prover (xhigh fast), and it got there. Very happy with Codex, I ditched Claude for it.
Leynos 3 hours ago|||
They've added a new goal mode that might help with that
yieldcrv 10 hours ago|||
Less gibliterrating and more doing

Very fast

beering 9 hours ago|||
Can’t you just turn off training on your data in the settings?
Rover222 13 hours ago|||
I think it's free for about 2 useful requests and then you have to upgrade or wait?
melagonster 10 hours ago|||
Switching to GPT 5.4-mini can increase the number of requests we can use freely.
osiris970 12 hours ago|||
So basically a 20$ Claude plan lmao
replwoacause 12 hours ago|||
I stopped using my Claude subscription because it became so prohibitive. Back to ChatGPT and Codex full time and been pretty happy. I miss the tone/writing style of Claude, but don't miss the frustration of being told I've reached my plan limits in a comically short amount of time.
dmd 11 hours ago|||
Using these prompts/steering[0], setting Base style to Friendly, Warm to More, Enthusiastic to Default, Headers, Lists, and Emoji to Less, I have found I can get gpt-5.5 about ... 80% of the way there to writing as non-annoyingly as Claude. And it's so much faster and has such higher limits that that's worth it for me.

I also put together this ridiculous thing[1] because I missed the font and color scheme of Claude.

[0] https://gist.githubusercontent.com/dmd/91e9ca98b2c252a185e8e...

[1] https://github.com/dmd/aimpostor

firesteelrain 10 hours ago|||
How do you fit that entire prompt in the customized instructions ?
dmd 10 hours ago||
Some of it is in my customized instructions, some of it I fed pieces in at a time saying "remember this please:" so it goes into Memories.

I'm not entirely clear on the mechanism by which memories make it into context, so it's possible some of it isn't all the time, but it does seem to be working reasonably.

Again, it's not as good as Claude when it comes to writing "not like an AI". But it's significantly better than it was.

replwoacause 11 hours ago|||
Thanks, I’ll give those a try!
dmd 11 hours ago||
FYI I'm actively working on aimpostor, so check back in a couple days for some quality improvements. (I'm definitely not going to bother with a Sparkle updater or anything like that.)
Razengan 11 hours ago|||
on Codex I ran into limits maybe like 2 times in 3 months, after doing several "upgrade this experimental game to my latest shared framework" passes on 5.5 Extra High
ssl-3 10 hours ago||
On which plan?

I can go through a 5-hour limit with a $20/mo Plus subscription in a few minutes with 5.5 Extra High. This causes me to reserve the latest/best rev for the harder problems.

5.5 really does seem to be very superior to 5.4, but it's also very expensive to run: The gas gauge moves fast. It's not very clearly defined whether 5.5 will cost less to get a problem solved quickly, or if a bunch of automatic iterations of 5.4 will solve it less-expensively. Both are often frustrating to me on the $20 plan.

(Also: Are you sure you're seeing it right? 5.5 has been in the wild for less than a month, so far. https://openai.com/index/introducing-gpt-5-5/ )

Razengan 7 hours ago||
The standard $20 plan, on my existing Godot code: https://github.com/InvadingOctopus/comedot

Most of those commits since the last few months are thanks to Codex reviews (but the code is not AI generated): 5.5 since it came out, and 5.4 etc before that, almost always on Extra High because it's for a framework that underlies the other stuff I do so I want make to sure everything's correct.

Sometimes I have to run multiple passes on the same task: I rarely continue any session beyond 4-5 prompts to avoid "bloat" or accumulate "stale context", so sometimes Codex finds different stuff in subsequent reviews of the same file/subsystem.

The project is modular enough where each file can be considered standalone with only 1-2 dependencies, and I already used to write a lot of comments everywhere (something some people laughed at), so maybe that helps the AI along?

ssl-3 6 hours ago||
Thanks. That's good data.

I'm taking this, along with my own experience, to mean that the GPTs are cheaper to use for refactors of an existing body of work than they are for creating a new one.

(And perhaps part of that is in the name? These "LLM" contraptions are very good at translation, after all. And tokens seem to relate more to concepts than to specific phrases or words.)

sidrag22 8 hours ago|||
the current state of that 20$ claude plan, despite twice this week them stating better usage. first for "double 5 hour usage", then for 50% overall more usage a week.

MAYBE the 50% overall is true, but the double usage during a 5 hour window i just dont see it at all. I've maxed 3 5 hour windows since this happened, 0% chance it was double as much as normal, i ate up about 4-5% of my weekly total each time(this was ~10% each time pre announcements). wish i could give token numbers but its obscured i just know it was around 120k 4.6 with some delegation to sonnet subagents.

So SURE its almost certainly more allotted weekly, but if those totals are consistent for 5 hour blocks, you gotta split your daily usage into at least 3 sessions with 5 hours between them to even hit that weekly limit. its unreal how much they have burned their good reputation in a 2 month stretch, i am positive its also being astroturfed with bots more than happy to advance the narrative.

the internet is annoying, these tools are overall cool, just wish anthropic would go back to being semi predictable.

thorum 12 hours ago|||
I was really unimpressed by the free Codex (for nodejs/react dev). I think it must be using a less powerful model or they’re limiting it in some other way.
jwilliams 11 hours ago|||
Are you specifically pointing at a different experience between free + paid? Or just that the free version is unimpressive?

I'm using paid on TypeScript and it's genuinely terrific. Subjectively I think it has the edge over Opus.

I'd be surprised if OpenAI is hamstringing the free version. That would seem crazy from a GTM PoV. If anything the labs seem to throttle the heavy paid users.

fragmede 11 hours ago||
Yes, the free version doesn't have access to the same models that the paid does.
debian3 11 hours ago|||
You have access to 5.5 xhigh on free. Which model is missing except the 5.3 that run on cerebras?
wahnfrieden 10 hours ago|||
It's only missing the trash models. Likely a user skill issue.
throw03172019 10 hours ago||||
The free version of ChatGPT is definitely worse as well. My SO uses the free version and I can tell a significant downgrade.
wahnfrieden 11 hours ago||||
Post your chat session
ssl-3 10 hours ago||
Can Codex chats be shared? (This is a genuine question; so far, I've only used Codex in CLI on Linux.)
wahnfrieden 10 hours ago||
Via jsonl file
dakolli 10 hours ago|||
I'm unimpressed by all LLMs, and especially unimpressed by the people claiming to be impressed by them.
cindyllm 10 hours ago||
[dead]
throwaway613746 13 hours ago||
[dead]
jumploops 13 hours ago||
I’ve been using Codex from my phone for the past couple of months (through a tunnel, not this app).

I was initially quite excited, but I’ve found the results are less than great compared to being at a keyboard.

Something about the smaller screen size and/or lack of keyboard causes me to direct the agent less, which in turn creates more tech debt/code churn/etc.

Maybe I’m just showing my age, and I should practice voice dictation or something more, but my thoughts flow faster and more clearly on a keyboard (less ums).

keyle 11 hours ago||
I'm not sure I follow, you develop code on a remote machine by speaking to your phone and are unimpressed by the result?
jumploops 8 hours ago|||
It's not that I'm unimpressed by the results, it's that I think I'm saving time by pushing the agent along remotely, but the reality is that my messages to the agent(s) end up being a lot shorter, which inevitably leaves more up for interpretation.

Don't get me wrong, I still use Codex (and sometimes Claude Code) remotely every day, and am overall excited for this release, it's just that the benefit wasn't as high as I had initially hoped.

Part of this is due to the models getting better (no need to prod along with "continue"), and part of this is the nature of how I use my phone (short bursts of attention).

But again, maybe I'm just old and prefer big screens with a keyboard.

satvikpendem 7 hours ago||
Just...write longer messages. Maybe it is age but I've written huge forum such as on HN all from my phone often with multiple tabs open to source various links for foot notes. When I type for an LLM, I will type a lot too if needed and will often even type a little, wait to think, then continue, over the course of like 15 minutes even, so that the intention of the prompt is correct since that saves much more time and produces better results than shorter messages.

I think you just need to type more rather than feeling constricted, as it's actually a form of liberation, to produce (or have an AI produce, whatever) something from wherever you are rather than needing to sit down on a laptop where you're gonna be waiting around anyway.

What tunnel setup do you use by the way? I'm on Android so it's kind of annoying all the LLM remote coding apps are iOS only.

jumploops 6 hours ago|||
Oh, I agree completely. I avoid loose language, revise my wording, and usually write prompts that require scrolling on mobile.

It isn’t so much that I feel restricted, I guess it’s that mobile wasn’t as big of a game changer as it was ~6 months ago.

My bandwidth feels more restricted by my own cognitive capacity (usually due to do context switching), rather than the limits of the model itself, and the mobile interface makes that worse.

I’ve recently found myself reserving larger tasks for “keyboard time” and reverting my thinking back to notes (in mobile), which I’ll then formulate to the LLM at some future time.

> What tunnel setup do you use by the way?

I “vibecoded” an agentic runtime that operates my machine generally (including TUIs like Codex/Claude Code), which I connect through a custom proxy and mobile app (both also vibecoded).

I previously tried Cloudflare Tunnels and an SSH setup, but it all felt a bit hacky.

Unfortunately the app is iOS only, but I could open source it and you’d probably be able to make an Android clone quickly (:

lmwnshn 6 hours ago|||
I've been coding on Android for a few months, mostly while walking around outside or showering. I'm on a mix of Tailscale + Termux + ssh server + tmux + codex CLI, Tailscale is great.

I think you may be able to optimize your workflow more by drafting your prompt in ChatGPT first; get it to expand out the intent for you. Doing that has made phone coding a lot more tolerable for me.

I like to think that I've given phone coding a fair shot (and I continue to do it), but I agree with the other poster that there's something about the lack of a keyboard that really gets to me :) I wish I knew what it was.

selcuka 11 hours ago|||
They are unimpressed by their (current) ability to use it, not the technology.
aiscoming 12 hours ago|||
the ums are exactly the sign that you speak much faster than you type, so you need a pause for your thoughts to catch up
fowlie 12 hours ago|||
I've been trying voxtype (using whisper models) lately, and to my surprise all my ums are filtered out. It's really good now actually!
esperent 10 hours ago||
I don't see any way to use that on a phone.
cm2012 9 hours ago|||
Wispr flow cuts out ums. I love it
redanddead 9 hours ago||
the main thing is functionality, you can always work around the ergonomics
mindmesh 7 hours ago||
The ability to unblock or redirect longer-running work from a phone seems underrated. Curious how often people will actually manage active coding threads this way.
tasuki 2 hours ago||
The right way to do this is Google Jules: the boundary is a git repository, the interface is a chat window you can open anywhere (yes, even simultaneously), the output is a diff you can choose to merge.

But, for whatever reason, no one uses Google Jules.

I don't want my phone to have the ability to execute things on my computer. Much less with a LLM in-between!

sumedh 2 hours ago|
Google might shut it down soon.
vohk 13 hours ago||
Dang, I thought this was going to be integration for Codex Cloud, not the (still not available for Linux) Codex App. Not even Codex CLI, alas. You can still access the Cloud option from a mobile browser well enough but I prefer an app UI for poking at the things on the go.
tekacs 13 hours ago||
You can do this from the CLI - `codex remote-control` works on Linux (I have no affiliation, just something I noticed).

They might just not have cut a new build yet, today. It 'works' on master, but the mobile app thinks that your build is outdated (v0.0.0) if you build from master without overriding version, so probably easiest to wait until they cut a build if they haven't.

embedding-shape 13 hours ago|||
> You can do this from the CLI - `codex remote-control` works on Linux (I have no affiliation, just something I noticed).

Woah, hadn't seen this before!

Off-topic, how long compile times do people have for codex-rs in openai/codex? Even my very beefy computer takes like 30 minutes to compile in release mode, makes me wonder why it's so slow and how this TUI got so large. But then I remember, agents like to write a lot of code, compilers get slower when they have to compile a lot of code :)

tekacs 12 hours ago||
Try turning off LTO. Their default codex-rs/Cargo.toml uses `lto = "fat"`, which is... expensive and slow and... you really really don't need it for a local build that you're not distributing.

In my experience, although the build is a little slow, it's that LTO step that takes a million years.

vohk 13 hours ago||||
Oh, that's promising, thanks! I've just been using the npm version.
asadm 13 hours ago|||
thanks. i dont use the app and so this is cool
beering 9 hours ago||
Codex Cloud has been in the chatgpt app for quite some time now. If you click out of the new dialogs then you can access your cloud threads
reassess_blind 12 hours ago||
Is there a native way to work remotely with Claude/Codex on a local folder or git repo on your main machine without having to connect it to GitHub? For creating apps for personal use I’d rather just keep the files local.

Edit: Running into issues setting it up on Windows. There's no "/remote-control" command in the CLI, so I installed the Windows Codex app. Then I updated the iOS app which now has the "Codex" feature in the sidebar, which should allow remote access to the Windows machine's instance - except it doesn't connect. The iOS app shows my desktop's hostname, so it knows there's an instance there, but refuses to connect. Issues like this would persuade a lot of folks to switch back to Claude.

barrkel 12 hours ago||
This is what /remote-control does in Claude Code, once it's running on your main machine. You can open it up in the phone app.
vardalab 9 hours ago||
It flakes out in less than 24 hrs. I tried leaving a session open on remote control mode in a VM but it inevitably stopped with some token auth error.
wolfoftheweb 9 hours ago|||
You can run Codex and Claude on mobile from https://github.com/happier-dev/happier
iamjs 12 hours ago|||
I think the `/remote-control` feature does this, if I understand you correctly.
DonsDiscountGas 12 hours ago|||
It's supposed to. I've always found it buggy and unreliable but maybe that's just me. (This command exists in Claude btw not sure about Codex)
rovr138 12 hours ago|||
Looks like codex has it too since last week, https://github.com/openai/codex/releases/tag/rust-v0.130.0
rovr138 12 hours ago|||
You can also connect remotely. Tailscale to connect to your network/machine. Then use SSH to login. Then use tmux to persist the session even if you log out.
maille 12 hours ago|||
Does it work on windows? And how do you then remote in?
wahnfrieden 11 hours ago|||
That’s this announcement.
reassess_blind 11 hours ago||
I ask because I tried the other week to use /remote-control in Claude, and it prompted to connect a Github repo with no local alternative. Things may have changed since then.

My experience today with the new Codex remote control has been that it doesn't connect at all.

Salgat 11 hours ago|||
I wish codex supported this, I use it all the time for claude.
nsonha 9 hours ago|||
I tried apps that do this workflow (happy coder being one), but the workflow itself is rather clunky. You have to first start the session inside the remote machine. I now only do ssh, I can start or resume on whatever device suits at the time. The only downside is latency and connection drops, mosh solves it.
Razengan 11 hours ago||
[dead]
brtkwr 4 hours ago||
Just tried it and it doesn't work... won't let me create a new task as the repo selection is disabled... works fine on my laptop on the other hand and have been using it for some time.
Riany 4 hours ago||
The best part is you don't have to stay at home waiting codex thinking, you can go out grab a coffee while connect your Codex and ask it to work
refactor_master 3 hours ago|
Surely you mean grab a coffee and sit back down at your desk in your corporate office, because working remotely while your agent also does so is just preposterous.
arend321 3 hours ago|
I've been trying out various mobile, ai-assisted coding workflows.

Packing a Linux mini-pc in my rucksack, connected to display glasses, and voice-to-text with handy. Voice to text gets injected into a remote (Docker) codex session, running a hot reload web stack. I prompt to implement various features in an existing code base, where codex understands the structure and requirements. If a feature is done, I take a moment to inspect the results on the display glasses, then move onto the next feature or keep iterating. It's not perfect, but I was able to implement a couple of not too complex features while walking my local national park. The display glasses have a built-in 4-microphone array, and solid speakers. No need for a bulky headset or earbuds. Glasses come with monochromatic dimming, you can easily switch between dimming and see through.

If this comes with Linux integration, I will certainly give it a try.

More comments...