This article explains how to delete My AI on Snapchat. Instructions are for the mobile app, but the directions on the web version are similar.
How do I delete my AI on Snapchat!
Unlike other Snapchat friends, you can’t remove the AI chatbot entirely, but you can hide it from your feed. That’s as good as deleting it.
If you are a Snapchat+ subscriber, follow these steps:
Open the Chat tab to view your conversations.