I Trained an LLM on 75K of My Own Messages So It Would Stop Writing Like a Chatbot

Frontier LLMs are good at figuring out what to say. They're bad at saying it the way you would. I've spent months using Claude and GPT-4o to draft content for a personal publishing system. The system prompt is detailed: first person, short sentences mixed with long ones, no LinkedIn buzzwords, lead with specifics. The drafts come back structurally correct every time. And they sound like a talented intern who studied my writing for an afternoon. Here's what a prompted frontier model produces when