Have we heard anything about this becoming available inside of the OpenAI Playground directly? What about 3.5-turbo-16k or 0613 being available in Azure? Last

Have we heard anything about this becoming available inside of the OpenAI Playground directly? What about 3.5-turbo-16k or 0613 being available in Azure? Lastly, how does this differ from just doing document retrieval Q&A using Langchain or just using embeddings directly?