---
title: Has the recent GPT-5 upgrade started making your existing projects…
type: post
date: 2025-08-10
source: linkedin
original_url: "https://www.linkedin.com/feed/update/urn%3Ali%3Ashare%3A7360221999605911553"
summary: Has the recent GPT-5 upgrade started making your existing projects hallucinate? You’re not alone. Anyone using the ChatGPT web interface has likely felt the impact. I have multiple inflight projects that were running smoothly until the upgrade starts…
draft: false
---

Has the recent GPT-5 upgrade started making your existing projects hallucinate? You’re not alone.

Anyone using the ChatGPT web interface has likely felt the impact. I have multiple inflight projects that were running smoothly until the upgrade starts hallucinating for follow-up questions. Attached is an example of a real hallucination.

If you're scrambling to recover, here's one quick fix:  
Switch back to the GPT-4o model while it's still available and get your work done.

Steps: Go to Settings → Enable "Legacy Models" → Select GPT-4o.

This is a temporary solution, but it helps restore stability for now.

Good engineering practices still matter—especially when upgrading to models with new behavior and parameters. Rolling out breaking changes without clear migration paths has a real impact on projects already in flight.

If you're mid-project, make the switch while GPT-4o is still accessible.

How has the recent GPT-5 upgrade affected your work?