Frontier Model
A frontier model is one of the most capable AI models available at a given moment — the latest flagship releases from the major labs that set the current ceiling on what's possible. The label moves: today's frontier model is next year's baseline.
Also known as: frontier models, frontier LLM
“Frontier model” is a relative label, not a fixed tier. It points at the handful of most capable general models at the current moment — the latest flagship releases that define the state of the art. Because the field moves fast, the frontier keeps shifting: a model that was frontier a year ago is now a mid-tier option you can often replace with something smaller and cheaper.
The term matters for build decisions. Frontier models earn their cost on open-ended, hard reasoning where capability is the constraint. For narrow, repeated tasks, you usually don’t need the frontier — the smart move is the smallest model that still passes your evals, reserving the frontier for the work that requires it.