---
title: "Fix Codex issues with Opus | Ian Nuttall"
description: "Fixing Codex issues with Opus"
canonical: "https://ian.is/post/codex-opus-fix"
language: "en"
---

# Fix Codex issues with Opus

Jan 2026 / 49,218 views / [via X](https://x.com/iannuttall/status/2015151661593813169)

I thought I was going mad, but 5.2 codex isn't running well today

I had to switch to opus 4.5,had issues like:

\- writing a lot of wrong code to create nextjs sitemaps even after being given the exact docs on how to do it (opus deleted it all and fixed it in one shot)
\- changing things not to do with what I asked (like text/content)
\- spending 10 minutes trying to figure out how to copy a tailwind 4 typography examplr from another project (opus did it in <1m)

![Image from the original X post](https://ian.is/media/tweets/2015151661593813169/2015151661593813169/d1bf63c8d7bfa5dffc1208a326c6d85c9ae323615325b0a36aa13b0123042e07.jpg)

[![](https://ian.is/media/tweets/2015143329055547451/413490474/26c7fa12c2c012ad63f0717dfe8e7e9f272441bd98370909819ce368d25606c3.jpg)**Alexander Embiricos**@embirico](https://x.com/embirico)

> @PacoMuro\_ What more specifically is happening for you? We are seeing a few reports and are looking into it

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