Stop Waiting for Better Models: Architecture is the Key to Agent Reliability
import_jmr · x · 2026-08-13
Many organizations are waiting for more reliable models before shipping agents, which is a poor bet. While METR data shows the length of tasks an agent can finish is doubling roughly every 7 months, business applications require much higher than 50% reliability.
Reliability Compounds Down: Even at 99% success per step, a long enough chain of tool calls becomes unreliable. A stronger model lifts the per-step number but doesn't remove the compounding effect.
Solutions from Shipping Teams: Instead of waiting, successful teams design products around current models.
- Sierra: Runs a second model as a supervisor to check responses against business rules before reaching the customer.
- Cognition’s Devin: Breaks work into small, verifiable pieces and treats code review as the actual barrier to production readiness.
Both approaches share the same high-level strategy: shorten the horizon to minimize error compounding space and put a checker in the loop before each step.
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