Instructor creator Jason Liu requested feedback on Codex spreadsheet workflows, prompting a joke about ironing
The inquiry targets performance friction points in spreadsheet automation
Many users reported problems with Codex automating spreadsheet workflows, citing slow speeds, frequent crashes, hidden data breakage, and errors like merged columns or flattened formulas.
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@jxnlco Doesn't iron well
What kind of issues do you run into when you are using Codex to work on sheets?

@thsottiaux I’ll share the feedback with the team!

@jxnlco Too slow

@sog_on_bird_app what model?

@jxnlco Like Google Sheets? If done via computer use, it’s incredibly slow. If done with the plugin, it often can’t find the right file.

@frrntc Screenshot?

@jxnlco slowwwww

@jxnlco It really likes to merge columns together, which makes it hard to edit without having to re-prompt and even then it will hallucinate and add in items that weren't part of the original thread or item.

@jxnlco just here to say, the sheets connector is like 700 times better than the one in Claude. and very thankful for that

5.5 refuses to import oai tool into the workspace. When I open the file excel says that it needs to repair it - minor inconvenience. Would be nice if all of the tools it needed for plugins didn’t need to exist in the workspace. Same issue for presentations, docs, etc. I use medium mostly + review for me.

@jxnlco Gpt5.5 xhigh of course

@jxnlco Not having 5.6 as an option 👀

@jxnlco thankfully i dont run into any work that involves sheets

@jxnlco Didn’t use it much. I don’t have the use case, the work i’ve done when needed, was good, can’t complain there.

@jxnlco Ability to click links within CSV preview would be sweet

@jxnlco i'm running into all sort of issues with codex in the sheets

@jxnlco Biggest one for me: agents flattening formulas into literal values when editing cells. The sheet looks right until next month's data lands. Merged cells confusing the grid model is a close second.

@thsottiaux @jxnlco facts

@jxnlco slow

Formulas. Formulas are often broken on the first pass, and then on the second some of them are often wrong and still need hand-checking everything.
Then model structure is often oversimplified and hard to extend.
It would be great if Codex were to ask A TON of questions in advance, unless the user is feeling lucky or unless the user 99% of the time, based on interaction history, chooses default answer.