Y Combinator's Winter 2025 Demo Day in San Francisco featured 160 startups, with approximately 80% focused on artificial intelligence. The cohort has been growing at a rate of 10% weekly, making it one of the most commercially successful batches in the accelerator's history. CEO Garry Tan revealed that about a quarter of the startups have 95% of their code written by AI, allowing them to operate with smaller teams and achieve significant milestones. Some companies have reached $10 million in revenue with fewer than 10 employees. The use of 'vibe coding,' where AI models generate software with minimal human input, has been a key factor in this growth. Many startups have already demonstrated early commercial validation, securing revenue and customer traction. Standout startups from the Demo Day included those developing AI tools for teleoperation, grading systems, and other applications, showcasing the diverse ways AI is being integrated into business solutions.