Your prompts get better while you sleep.
The LLM gateway that routes, monitors, and automatically improves your prompts — no code changes required.
Route every API call through a few lines of code.
Diagnose which prompt is burning your budget.
Watch variants A/B test and promote themselves.
Every other tool shows you what happened. None of them close the loop.
PlainField AI routes your LLM traffic, runs statistical analytics to surface which prompts are costing you, generates variants, and A/B tests them with Thompson sampling until a winner emerges. Then it promotes automatically. Observation was step one. This is step two.