The API Layer Is More Durable Than the Company

OpenAI's competitive advantage rests on the thousands of applications and workflows built into its API. Once developers embed an API into production systems, migration becomes a coordination problem across their entire stack, creating switching costs that persist even if the company's research leadership falters. OpenAI's infrastructure layer could outlast its consumer brand or research dominance. Kimi, by contrast, operates as a standalone product without forced integration, revealing that platform defensibility now stems from integration depth rather than feature novelty—a pattern that applies across AI vendors as the market matures beyond chatbot differentiation.