Nvidia's Agent Harness Breakthroughs and the 'Genie Behavior' Problem

The most significant development isn't a new model, but a fundamental shift in what makes AI agents work: the harness, or the software wrapper around a model, is now the critical performance multiplier. Nvidia's research shows that by refining the harness—specifically memory management and adding a 'supervisor' component—they achieved a 100% score on the ARC-AGI-3 benchmark using Claude Opus 5, a model that scored only 30% without this scaffolding. This validates the...