09/08/2026
AI model comparisons focus on intelligence, speed, and cost. They often overlook the system that determines how the model operates.
That system is the agent harness. It controls the tools the agent can use, the context it receives, the systems and data it can access, how its work is verified, and what evidence is recorded.
Two platforms can use the same model and produce very different results. The agent harness determines whether that model can perform reliably in real workflows.