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OpenAI Codex CLI: Lightweight coding agent that runs in your terminal

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514 points mfiguiere | 1 comments | 16 Apr 25 17:24 UTC | HN request time: 0s | source
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gklitt ◴[16 Apr 25 20:37 UTC] No.43710093[source]▶
I tried one task head-to-head with Codex o4-mini vs Claude Code: writing documentation for a tricky area of a medium-sized codebase.

Claude Code did great and wrote pretty decent docs.

Codex didn't do well. It hallucinated a bunch of stuff that wasn't in the code, and completely misrepresented the architecture - it started talking about server backends and REST APIs in an app that doesn't have any of that.

I'm curious what went so wrong - feels like possibly an issue with loading in the right context and attending to it correctly? That seems like an area that Claude Code has really optimized for.

I have high hopes for o3 and o4-mini as models so I hope that other tests show better results! Also curious to see how Cursor etc. incorporate o3.

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ilaksh ◴[16 Apr 25 20:54 UTC] No.43710290[source]▶
Did you try the same exact test with o3 instead? The mini models are meant for speed.
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1. gklitt ◴[16 Apr 25 21:57 UTC] No.43710850[source]▶
I want to but I’ve been having trouble getting o3 to work - lots of errors related to model selection.