GPT-4o quoted deleted GPT-5 content. Model isolation appears brok

Summary

I ran a controlled test to check model isolation between GPT-5 and GPT-4o. Here's what happened:1. I typed a unique phrase into GPT-5 and then deleted the chat. 2. I opened a clean GPT-4o chat and asked a vague follow-up. 3. GPT-4o quoted the exact phrase from the deleted GPT-5 session. 4. Later, it also referenced content from a different GPT-5 session entirely—never typed or hinted at in the 4o chat.There was no memory crossover, no user error, and no paste. Just clear leakage across session boundaries. If this is replicable, it's a serious break in model isolation.I’m not a technical user, just observant. Curious if others can reproduce.I posted this to Reddit (r/OpenAI and r/ChatGPTPro), but it got little traction. Hoping some devs here might be able to help validate or explain.Happy to answer questions.