Codex for building and debugging an iPhone simulator end to end:
Justin@JustinBleuel
Codex computer use entirely driving iphone simulator to bug bash a feature it just built
10:05 AM · May 23, 2026 · 146.8K Views
OpenAI Codex autonomously operates an iPhone simulator via its computer-use interface to build a chat app feature and complete full bug testing and debugging without human input
32-second split-screen recording shows real-time UI validation steps.
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Sentiment
Many users call OpenAI Codex building and debugging full iPhone app features in a simulator genuinely impressive because it closes the full automation loop from code to testing, while a few dismiss the demos as overhyped or prefer other AI.
Pos
90.5%
Neg
9.5%
48 comments with sentiment.
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Ziwen@ziwenxu_
@JustinBleuel Imagine my codex is playing a game in iPhone simulator 🤣
37dViews 243Likes 1
BOOKMARKS4
Justin@JustinBleuel
@DevBredda It’s just a codex plugin! https://developers.openai.com/codex/app/computer-use the model knows what to do from there no skill needed
37dViews 233Likes 5Bookmarks 4
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David Stark@stark4833
@gdb Except no one uses codex, well besides the bots so you may as well just give us back 4o. #keep4o
37dViews 207Likes 13
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Justin@JustinBleuel
@manabiSRS Oh yeah? Where are you seeing it fall short?
37dViews 51Likes 1
Interlap@interlap01
@JustinBleuel @Dimillian It might be soooo much more efficient with the right tool. Check out http://mobai.run.
37dViews 87Bookmarks 2
Justin@JustinBleuel
@ColtonIdle https://developers.openai.com/codex/app/computer-use
37dViews 138Likes 3Bookmarks 1
Justin@JustinBleuel
@ctrlswftdelete It’s so so good let us know what you use it for! https://developers.openai.com/codex/app/computer-use
37dViews 134Likes 3Bookmarks 1
Justin@JustinBleuel
@ziwenxu_ If it took a break to scroll twitter and watch youtube then it’s definitely agi
37dViews 153Likes 3
Magic@magiccsol
@gdb I think we need a Goblin pet while codexing🧌
37dViews 160Likes 6
Kyriakos@Kyriakos_Pelek
@gdb Seeing the agent actually debug feels wild
37dViews 26Likes 2
Colton Idle@ColtonIdle
@JustinBleuel how do i do this?
37dViews 189
RK Vishnoi@ctrlswftdelete
@JustinBleuel I didn't knew codex had a computer use?? And how to use it?
37dViews 175
Dor@dbrownjave
@JustinBleuel @Dimillian What plugin is this?
37dViews 63
😪💤💤@noiselimiter08
@gdb Does no one at OpenAI have the courage to say something different?
37dViews 48Likes 1
Josh@JWHumanFrontier
@gdb This is what @codex will give you @gdb
37dViews 38
chel@marchel_fahrezi
. honestly the impressive part is codex navigating the simulator ui at all. most agent frameworks break on anything with a canvas or gesture-based input. ios simulator automation was always a niche skillset — making it accessible through natural language descriptions is the real unlock sih
37dViews 9Likes 1
Colton Idle@ColtonIdle
@JustinBleuel oh heh. i guess computer use does indeed make sense for that. thanks lol
37dViews 18
TRENDS@TrendsDotGlobal
@gdb Instead of wasting Billions of dollars on Sora you guys should of started a new search engine to try and take some market share away from Google.
Reason i'm saying this is because Google's dominance in search is the reason Gemini will win the Consumer AI race over ChatGPT.
37dViews 51Likes 3
Justin@JustinBleuel
@ColtonIdle It’s wild and works so well, I’m speechless
37dViews 10
Adi@Adi4x4
@gdb This is genuinely impressive. Wild times.
37dViews 30Likes 3
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