The AI Arms Race Winner Won't Be the One With the Best Model — How Harness Became the Real Moat
In 2026, the decisive advantage in the AI industry is shifting: LangChain jumped 25 ranks on TerminalBench by changing only its Harness, OpenAI launched a $14B deployment company, and NousResearch went from 8 followers to a $1B valuation. This article dissects how model-external engineering is becoming the new center of power.