Hi there,
It sounds like you’re facing quite a challenge with your custom GPT model. One approach that might help is integrating a custom API in action function to handle specific, detailed queries. GPT models are great for text understanding and generation but can struggle with large, structured datasets, like your 600+ page documents. By using an API, you can preprocess and structure this data more effectively. This API can then specifically deal with queries about product codes, while the GPT handles the generation of user-friendly responses and less structured queries. This hybrid approach leverages the strengths of both: the detailed data management of an API and the conversational abilities of GPT. It might also help in reducing errors and improving consistency in responses. Hope this helps, and best of luck with your project!