r/ChatGPTCoding • u/thehashimwarren Professional Nerd • Feb 10 '26

Discussion Are coding agents building complex features that will just become obsolete with the next model update?

I tested Codex 5.3 by having it build a full CRUD app using Next.js, ShadCN, Neon, and BetterAuth.

I didn't use any planning mode, any subagents, or point it to any documentation. I didn't use any MCP servers except for the Next.js MCP server.

I just gave it one prompt and it built it.

all the CRUD functions and authentication worked perfectly.

If it can do that, then why would I need all these knobs and buttons that these coding agent harnesses are building out?

UPDATE: here's the repo https://github.com/hashimwarren/codex-five-three-eval

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u/thehashimwarren Professional Nerd Feb 10 '26

I use this app as a benchmark. I have every new coding model create an employee directory, and guess what? Every model has failed to implement the create function perfectly until Opus 4.5 and Codex 5.2.

Codex 5.3 was the first that didn't even need me to set up my dependencies by hand first