I consulted for an AI startup that raised $5M, hired 12 engineers, and spent 8 months building a…

custom LLM from scratch.

They ran out of money before launching.

A competitor with 3 engineers fine-tuned Llama, built a solid product layer on top, and captured the market in 4 months.

The lesson I keep relearning: in AI startups, speed to market beats technical perfection every single time. Your users don't care if you trained your own model. They care if your product solves their problem.

Build the simplest thing that delivers value. Ship it. Iterate. The perfect architecture is the enemy of the shipped product.

Most failed AI startups didn't fail because their tech was bad. They failed because they were building a rocket ship when the customer needed a bicycle.