Hard tech companies, focusing on physical infrastructure like robotics, defense, and semiconductor stacks, have surged from 8% to 20% of YC batches. This shift is driven by AI-powered agents that accelerate research and development, allowing startups to reach significant revenue milestones in months rather than years. Simultaneously, the profile of a successful founder is evolving; experienced professionals and solo founders are increasingly leveraging AI to manage complex workflows, effectively reducing the need for large, traditional engineering teams. Furthermore, the demand for proprietary data and reinforcement learning environments has created a lucrative new category, with AI labs investing heavily to secure the specialized data necessary for frontier model training. These trends indicate that the most valuable software now functions as an "AI harness," automating entire professional tasks rather than acting as mere systems of record.
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