Pick your agent memory architecture by the accuracy-vs-latency trade-off, not by hype

Atlan·medium signal

A 2026 survey of agent memory lays out five production patterns from zero-infrastructure to enterprise governance — In-Process/Working-Only, Flat External Vector Store, Tiered Memory, Knowledge-Graph+Vector Hybrid, and Enterprise Context Layer — with measured trade-offs spanning 72.9% accuracy at 17.12s p95 latency down to 66.9% at 1.44s. Builder move: treat memory as an explicit architecture decision with a benchmark, choosing the tier that fits your latency budget rather than reaching for the most 'sophisticated' graph-hybrid by default — the fastest pattern is only ~6 points less accurate but ~12x faster.