Small, local and edge models
When it pays off
A narrow, recurring task with a fixed format; a privacy or regulatory requirement; volume that makes pay-per-use expensive; or a need for an instant response with no network dependency.
What you pay in return
Operations: hardware, availability, updates, monitoring, and a team that knows how to maintain it. And: the quality gap on open tasks still exists, even if it's narrowed.
A middle path
Routing by difficulty: the small model handles most requests, and hard ones go to a strong model. That's usually the optimum — low cost with quality preserved where it matters.
You can also distill: use a strong model to generate quality examples on which you fine-tune a small model for a specific task.
Going deeper
Measure throughput in concurrent requests, not just a single response time. A local model behaves entirely differently under load, and capacity planning done by a single-user test always leads to a surprise at launch.