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Issue 23.5 ('Shared Notes App')
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COLUMN

Fixing ChatGPT Document Analyzer

OpenAI Broke It—Here's the Fix

Issue: 23.5 (September/October 2025)
Author: Marc Zeedar
Author Bio: Marc taught himself programming in high school when he bought his first computer but had no money for software. He's had fun learning ever since.
Article Description: No description available.
Article Length (in bytes): 7,483
Starting Page Number: 44
Article Number: 23506
Resource File(s):

Download Icon project23506.zip Updated: 2025-09-01 16:19:34

Related Link(s): None

Excerpt of article text...

While I was writing my piece about artificial intelligence for this issue, I tried to use last issue's ChatGPT Document Analyzer to process a CSV document. The app returned a bizarre error message, stating that I was using an unsupported file type (see Figure 1).

I played around with this for some time, trying to figure out what was wrong. Naturally, I assumed there was a bug in my code—except nothing had changed, so how could a bug show up months later?

I finally asked ChatGPT itself and received this response:

It looks like .txt uploads stopped working for many users starting around late May 2025. Several devs reported that what had been working as recently as last month suddenly began failing—with consistent "unknown error occurred" messages when trying to upload .txt files via the Assistants API or ChatGPT interface.

? What's Likely Happening

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