Why do all OpenAI models suddenly lose memory / context

Describe the Bug

This has happened several times both in GPT5 and o3, I have been using o3 for months now and I find it has incredible accuracy and restraint when it comes to coding - but all of a sudden it will suddenly just get amnesia or just complete change characteristics part way through a conversation.

Steps to Reproduce

Its not something easy to replicate - its just something that has become obvious since the last few updates

Expected Behavior

For o3 to behave as it always has

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.4.4 (Universal)
VSCode Version: 1.99.3
Commit: dd05130a0bf8d5f1a5372e6e6bb7c4184786eaa0
Date: 2025-08-10T22:39:50.197Z (1 day ago)
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

I dont know if you can see this request ID but look how many times it straight up fails to edit the file but thinks it has (and even tells me the code exists there but the file is unmodified):

48ff7702-15f4-4d96-bd3d-073a71b6b8d6