MY RAG VS OPENAI CUSTOM GPT

I NEED YOUR ANSWERS.

SO for the last few weeks i was building a RAG using LangChain + Pinecone + Open AI. so it is done now
and i noticed that there is some thing called CUSTOM GPT. which is kind of the same thing .

so my question is which one is better. in different comparison. should i cancel my application and just use Custom GPT ? what is your point on this ?