51 engineers on Hacker News describe using OpenAI Codex first-hand: 18 endorse it, 5 regret it, 6 are mixed.
“Codex usage limits have really gone down hill so I also now have a $10 opencode go subscription”
mixed · production · 1 yr · rcgeorge23 · 2026-11-05 · source ↗ · wrong label?“Well this sucks, but not unexpected. I've been using Chat for all my Codex/Work tasks precisely because of the fact it didn't affect usage.”
regret · personal · mellosouls · 2026-11-01 · source ↗ · wrong label?“I've been using Codex ... to do the annoying work ... And it's been flawless so far”
endorse · production · kikdij · 2026-10-29 · source ↗ · wrong label?“We heavily depend on codex doing all sorts of administrative stuff”
endorse · production · jillesvangurp · 2026-10-29 · source ↗ · wrong label?“codex is eating my disk, too. Ironically my solution is mostly codex”
mixed · personal · madaxe_again · 2026-10-17 · source ↗ · wrong label?“Claude Code/Codex has made my entire macOS environment as malleable as Emacs. That's huge!”
endorse · personal · 1 yr · GeneralMaximus · 2026-10-16 · source ↗ · wrong label?“In my company using Codex and Claude help us a lot with our software.”
endorse · production · testerius · 2026-10-07 · source ↗ · wrong label?“Codex CLI permissions for example are extremely broken.”
regret · personal · srcreigh · 2026-09-21 · source ↗ · wrong label?“If I ask Codex or Claude Code to build me an API endpoint that queries a database and returns JSON, including with tests, they're going to get that right.”
endorse · personal · simonw · 2026-08-14 · source ↗ · wrong label?“Sometimes I even just point Claude Code / Codex at an open-source thing I want to vendor some functionality into my personal setup with and it gives me what I want.”
endorse · personal · arjie · 2026-07-12 · source ↗ · wrong label?“Preference is Claude Opus and Codex whatever the latest model is.”
endorse · production · thraway3837 · 2026-07-08 · source ↗ · wrong label?“I use Cursor and Codex but the agents keep making regressions and breaking rules.”
regret · personal · nilirl · 2026-05-30 · source ↗ · wrong label?“I used Claude Code and Codex to do a proper, compliant port that passes the full set of tests and is safe.”
endorse · production · rozzie · 2026-03-27 · source ↗ · wrong label?“I launched Codex and started asking it questions about the code.”
endorse · personal · raw_anon_1111 · 2026-02-11 · source ↗ · wrong label?“I've been using Codex and Claude Sonnet for many months now for personal (Codex)”
endorse · personal · dent9 · 2025-12-30 · source ↗ · wrong label?“which is why my personal conclusion in the post is to just lean into Codex.”
endorse · personal · mergesort · 2025-12-27 · source ↗ · wrong label?“codex is poor at instruction following because I see it go off plan most of the time... codex is great [for prototyping]”
mixed · personal · lmeyerov · 2025-12-26 · source ↗ · wrong label?“GPT codex given good enough context and harness will just go.”
endorse · personal · 1 yr · baq · 2025-12-26 · source ↗ · wrong label?“That's why I don't dismiss people who live in Claude Code, even though I personally prefer Codex.”
endorse · personal · mergesort · 2025-12-26 · source ↗ · wrong label?“as a second line of defence I'm getting better code reviews out of it than I've ever had from a human.”
mixed · personal · petesergeant · 2025-12-21 · source ↗ · wrong label?“We use both Claude and Codex on a fairly large ~10-years old Java project”
mixed · production · mazswojejzony · 2025-12-19 · source ↗ · wrong label?“I sometimes also try Codex which is also not bad.”
endorse · personal · jaigupta · 2025-12-18 · source ↗ · wrong label?“I've been using Codex CLI heavily after moving off Claude Code”
endorse · personal · kordlessagain · 2025-12-18 · source ↗ · wrong label?“I've been using Claude and Codex to create bespoke systemd services... really impressed by how easy it is”
endorse · personal · ewoodrich · 2025-12-18 · source ↗ · wrong label?“Switched over to Codex when 5.1 came out. WOW. Really nice acceleration in my Rust/CUDA project which is a gnarly one.”
endorse · personal · mmaunder · 2025-12-11 · source ↗ · wrong label?“codex is unusable and fights me the whole time.”
regret · personal · verdverm · 2025-12-11 · source ↗ · wrong label?“using Claude Code / Codex 4+ hours a day... I frequently see (both) agents make wrong assumptions that inevitably take multiple turns”
mixed · production · ewoodrich · 2025-12-03 · source ↗ · wrong label?“It's been an incredible boon for me at least - extending, refactoring, prototyping etc.”
endorse · personal · wahnfrieden · 2025-11-28 · source ↗ · wrong label?“I haven't seen Codex ever be good yet, and I regret the time I invested trying it too early.”
regret · personal · veidr · 2025-10-21 · source ↗ · wrong label?“we recently cancelled a few seats on claude code / codex as we simply were underutilising.”
neutral · production · anonzzzies · 2026-11-05 · source ↗ · wrong label?“with my vx-maintainer expert, codex, opencode and claude-code as harnesses.”
neutral · personal · poelzi · 2026-11-05 · source ↗ · wrong label?“I use them interchangeably, I don't see much of a difference.”
neutral · personal · thibsrn · 2026-11-05 · source ↗ · wrong label?“This allows us to use several different model families through Claude, cursor and codex without having to copy paste everywhere.”
neutral · production · naw103 · 2026-11-05 · source ↗ · wrong label?“Codex for my OpenAI subscription (I usually only keep one of those at a time)”
neutral · personal · peepee1982 · 2026-11-04 · source ↗ · wrong label?“I've been using ChatGPT since release and Codex since before ChatGPT was a thing (with the original Codex model).”
neutral · personal · brianjking · 2026-11-01 · source ↗ · wrong label?“After a month on Codex, I switched to Hax.”
neutral · personal · sivers · 2026-10-31 · source ↗ · wrong label?“My Codex and Claude Code bots (and Copilot at work) run on it pretty much around the clock”
neutral · personal · sybhn · 2026-10-30 · source ↗ · wrong label?“I only used ~10% of my weekly limit on Codex (granted, I have the $100/mo plan)”
neutral · personal · jordan_bonecut · 2026-10-23 · source ↗ · wrong label?“I made Codex write a POSIX vi implementation from POSIX ex/vi specs. It took it a week-end”
neutral · personal · kikdij · 2026-10-23 · source ↗ · wrong label?“I've been using ghosty + ssh + mosh + tmux + claude code (sometimes codex) for a while now.”
neutral · personal · mkw5053 · 2026-10-19 · source ↗ · wrong label?“I've had many times when `codex /review` comes back satisfied on the first shot, both with handwritten and LLM-assisted PRs.”
neutral · production · bgoated01 · 2026-10-11 · source ↗ · wrong label?“whenever codex need some info about the packages we use, it just use ILSpy to decompile the nuget”
neutral · production · sreekanth850 · 2026-10-10 · source ↗ · wrong label?“Pay for OpenAI Pro directly, but I'm the only guy that uses Codex.”
neutral · production · trollbridge · 2026-06-23 · source ↗ · wrong label?“We run a "context" repository that enables us to transition pretty seamlessly from model to model (usually codex to claude and back).”
neutral · production · NichoPaolucci · 2026-06-04 · source ↗ · wrong label?“At this point, most of that is managed via codex.”
neutral · production · jillesvangurp · 2026-05-26 · source ↗ · wrong label?“Claude writes code, Codex reviews the plan and the diff, Cursor bugbot triages PR findings.”
neutral · production · axledbetter01 · 2026-05-19 · source ↗ · wrong label?“every single bead (epic, ticket) and every single line of code has been written by AI (using a mix of claude, codex, cursor-agent/composer-1).”
neutral · personal · rahimnathwani · 2025-12-30 · source ↗ · wrong label?“We've been using Claude Code, Gemini CLI, and Codex in parallel for a while.”
neutral · production · qiakai · 2025-12-19 · source ↗ · wrong label?“Claude, Gemini and Codex are currently working together on implementing FIPA ACL inter agent communication”
neutral · personal · vmitro · 2025-12-16 · source ↗ · wrong label?“We use a few depending on the task (Codex, fine-tuned T5, Bert models, etc.).”
neutral · production · morgante · 2022-12-22 · source ↗ · wrong label?