Bill BrownFounder of ServiceTitan Hacks community (9k+ pros) | INC 5000 Contractor | Helping contractors win with AI & Automation

Build Your Own LLM: Japan Fish Market vs. Gas Station Sushi #shorts

13 Mar 2026 · 1 min

Watch on YouTube

1:06

In this YouTube short, the speaker contrasts using generic AI services with building a custom large language model (LLM) and retrieval system. He likens off‑the‑shelf AI to cheap "gas‑station sushi"—convenient but low quality—while constructing your own LLM, vectorized database, and SQL schema is compared to shopping at a Japanese fish market, offering superior, tailored results. He explains the process of chunking and vectorizing every piece of information, then warns that simply connecting a pre‑built AI to a siloed data source like Google Drive limits knowledge integration and hampers strategic growth. Finally, he proposes creating hyper‑specialized AI agents that replicate the work of experts who spend hours daily teaching, consulting vendors, and adjusting projects, thereby delivering focused, expert‑level assistance.

Chapters

Using readily available AI is like buying gas station sushi. Building your own LLM and your own retrieval model, your own database, your own SQL schema is like going to the fish market in Japan. So the LLM is, I'm building it in such a way, I'm storing and vectoring, like chunking and then vectoring every single piece of information that is available. Now, when you start interacting with it, Instead of AI, kind of like let's say ChatGPT, you connect your Google Drive to it, it's going to give you information that you have in your Google Drive, but the knowledge lives in silos and it is not benefiting the plans and growth for the, uh, for the, for what they want, for their goals. There's these two individuals that are really, really good at what they do, and all they do is they're on the phone 5, 6 hours a day teaching people, walking people through, calling vendors, doing course corrections on their projects. You just created an an agent that is hyper-specialized in exactly what you do.