OpenAI and Anthropic builds extremely fast, even more so than most startups. There's little point building things like langchain, because OpenAI will build a be

OpenAI and Anthropic builds extremely fast, even more so than most startups. There's little point building things like langchain, because OpenAI will build a better product a few months later. But you can build a product connected to OpenAI fine. Anthropic uses a similar API. Most of the smaller LLMs will also copy the same design so switching is cheap. It's probably not a smart idea to be completely dependent on OpenAI either. They're down all the time, can ban you on a whim, and their customer service is inaccessible.