What is Harness Engineering? The next battleground for AI isn’t the model—it’s the layer of architecture outside the model
In 2026, a new consensus emerged in the AI industry: what determines whether an AI product is good or bad is no longer the model itself, but the layer around the model called “harness.” As the underlying models used by Claude Code, Cursor, and OpenClaw grow increasingly similar, what truly creates a product gap is the design of the harness. Martin Fowler’s technical blog, Anthropic product lead trq212, and Andrej Karpathy’s recent remarks all point in the same direction: the next battleground for AI is
ChainNewsAbmedia·11h ago