Fireworks AI cofounder: training is now an economics play for AI apps

sophiamyang · x · 2026-11-05

Fireworks AI cofounder thebunnychen on why app companies train custom models:

Training is now an economics play: sustained usage costs, not acquisition costs, limit AI app scale — the inverse of Web 2.0 where serving an extra user was nearly free and ads drove costs.
Cheaper models are a growth enabler: cheaper → more users → more data and better evals → faster scaling. Founders optimize wall-clock time and will pay more for faster, better results.
Fireworks reuses training recipes across customers so startups don't repeat each other's mistakes.
"No eval" approach: teams can start training without offline evals — your traffic is the training signal.

More from Companies & People