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GPT-5-Codex

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Re: GPT-5-Codex

#111

Post by theshrike79 »

twalichiewicz wrote: post #40

It's been interesting reading this thread and seeing that others have also switched to using Codex over Claude Code. I kept running into a huge issue with Claude Code creating mock implementations and general fakery when it was overwhelmed. I spent so much time tuning my input prompt just to keep it from making things worse that I eventually switched. Granted, it's not an apples-to-apples comparison since Codex has t…

1) create plan in plan-mode

2) ask it to implement plan

That's the way to work with Claude.

Other systems don't have a bespoke "planning" mode and there you need to "tune your input prompt" as they just rush in to implementation by guessing what you wanted

Re: GPT-5-Codex

#112

Post by thurn »

Does the "caching containers for Codex Cloud" mean I have some chance of being able to reuse build artifacts between tasks? My Rust project takes around 20 minutes to set up from scratch in a new Codex environment, which seems extremely expensive.

Re: GPT-5-Codex

#113

Post by replyfabric-ai »

bigwheels wrote: post #48
e1g wrote: post #45

Earlier quoted context omitted.

Extremely slow for me - takes minutes to get anything done. Regular GPT5 was much faster. Hoping it’s mostly due to the launch day.

I've been using gpt-5 on effort=high but for gpt-5-codex, try: `-c model_reasoning_effort=medium`. On high it is totally unusable.

even on medium ... gpt-5 was way faster, at least that's my first impression

Re: GPT-5-Codex

#114

Post by CuriouslyC »

theshrike79 wrote: post #107
CuriouslyC wrote: post #69

Earlier quoted context omitted.

Don't. Claude is worse for everything but coding, and even then it's mostly better for coding in greenfield/small projects, and it makes a mess of large projects. The only thing really good about Claude was the plan economics, and now I'm not so sure about it.

It only makes a mess of large projects if your CLAUDE.md and docs/ are out of date. It has a very specific style and if your project isn't in that style, it starts to enforce it -> "making a mess".

Nah bro. I have a Claude Code hall of shame, where Sonnet gets derailed by the most trivial shit, and instead of finishing actual research code that's been clearly outlined for it (like, file by file level instructions), it creates a broken toy implementation with fake/simulated output ("XXX isn't working, the user wants me to YYY, let me just try a simpler approach...") and it'll lie about it in the final report, so if you aren't watching the log, sucks to be you.

I have an extensive array of tripwires, provenance chain verifications and variance checks in my code, and I have to treat Claude as adversarial when I let it touch my research. Not a great sign.

Re: GPT-5-Codex

#115

Post by mvieira38 »

jumploops wrote: post #28
siva7 wrote: post #22

Earlier quoted context omitted.

So you're all saying suddenly codex cli w gpt 5 codex is better than claude code? Hard to believe

Not suddenly, it's been better since GPT-5 launched. Prompting is different, but in a good way. With Claude Code, you can use less prompting, and Claude will get token happy and expand on your request. Great for greenfield/vibing, bad for iterating on existing projects. With Codex CLI, GPT-5 seems to handle instructions much more precisely. It won't just go off on it's own and do a bunch of work, it will do what you…

This has been my experience even in Cursor. I often select the GPT-5 option because I know it will "know" better how much reasoning effort it needs

Re: GPT-5-Codex

#116

Post by gen220 »

aitchnyu wrote: post #81
faangguyindia wrote: post #77

Earlier quoted context omitted.

i just use aider + gemini pro, here's the project i developed: https://aretecodex.pages.dev/tools/

Did anybody switch away from Aider for a compelling alternative? What was the feature?

I was a #1 aider stan for months, but ultimately switched to Claude Code.

For me it was (1) lack of MCP (2) excessive hand-holding required (3) availability of the Max plan meant I wouldn't have to monitor cost.

Claude Code's skill curve felt slightly longer than aider's, and had a higher ceiling.

I think if I were more cost-sensitive, I would give Aider another whirl, or Gemini CLI (based on what I've heard, I haven't used it yet).

Re: GPT-5-Codex

#118

Post by [deleted] »

aitchnyu wrote: post #81
faangguyindia wrote: post #77

Earlier quoted context omitted.

i just use aider + gemini pro, here's the project i developed: https://aretecodex.pages.dev/tools/

Did anybody switch away from Aider for a compelling alternative? What was the feature?

[deleted]

Re: GPT-5-Codex

#120

Post by TomaszZielinski »

theshrike79 wrote: post #95
raincole wrote: post #87

Earlier quoted context omitted.

Why not Gemini CLI tho?

It doesn't have a working plan mode. If you ask it to plan something or suggest something. It'll write the suggestion and dive right into implementation with zero hesitation.

It's not my experience, but then I have a „living” GEMINI.md doc where I add/clarify/tweak what to do and what not to do. And it's possible the initial revision already contained the correct spell :)
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