Vibe Coding Is The Future

YC partners Gary Tan, Jared Harge, and Diana survey the current YC batch and find 25% of founders have AI-generated codebases above 95%.

• 1 in 4 current YC founders report 95%+ of their codebase is AI-generated, including highly technical founders.
• One founder reports coding speed went from 10x six months ago to 100x now, calling the acceleration exponential.
• Cursor leads IDE adoption; Windsurf is the main challenger because it auto-indexes the whole codebase without manual file targeting.
• Claude Sonnet 3.5 remains the top coding model but o1, o1 Pro, and o3 reasoning models are now nearly neck-and-neck for debugging tasks.
• LLMs are still poor at debugging; founders must either spoon-feed explicit instructions or restart from scratch rather than fix incrementally.
• Engineers are splitting into two roles: product engineers (taste, user empathy) and systems architects (scaling, infrastructure)—vibe coding accelerates the former, not the latter.
• Technical founders who cannot catch AI errors are vulnerable the same way non-technical managers get lied to by engineers who know they won’t be called out.
• Zero-to-one speed is where vibe coding wins; Twitter and Facebook both showed that Rails/PHP-style fast starts eventually required classical systems engineers to scale.

2025-03-05 · Watch on YouTube