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

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.

Claude Code still feels superior. o4-mini has all sorts of issues. o3 is better but at that point, you aren't saving money so who cares.

I feel like people are sleeping on Claude Code for one reason or another. Its not cheap, but its by far the best, most consistent experience I have had.

Claude Code is just way too expensive.

These days I’m using Amazon Q Pro on the CLI. Very similar experience to Claude Code minus a few batteries. But it’s capped at $20/mo and won’t set my credit card on fire.

> Upgrade apps in a fraction of the time with the Amazon Q Developer Agent for code transformation (limit 4,000 lines of submitted code per month)

4k loc per month seems terribly low? Any request I make could easily go over that. I feel like I'm completely misunderstanding (their fault though) what they actually meant.

Edit: No I don't think I'm misunderstanding, if you want to go over this they direct you to a pay-per-request plan and you are not capped at $20 anymore

You are confusing Amazon Q in the editor (like "transform"), and Amazon Q on the CLI. The editor thing has some stuff that costs extra after exceeding the limit, but the CLI tool (that acts similar to Claude Code) is a separate feature that doesn't have this restriction. See https://aws.amazon.com/q/developer/pricing/?p=qdev&z=subnav&..., under "Console" see "Chat". The list is pretty accurate with what's "included" and what costs extra.

I've been running this almost daily for the past months without any issues or extra cost. Still just paying $20

I see, thanks. The 4k limit for the gui still seems so low, but I might try the cli sometime.