This node establishes a connection with an OpenAI Large Language Model (LLM). After successfully authenticating using the OpenAI Authenticator node , you can select an LLM from a predefined list or explore advanced options to get a list of all models available for your API key (including fine-tunes). Note that only models compatible with OpenAI's Completions API will work with this node (unfortunately this information is not available programmatically). Find documentation about all models at OpenAI .
If you a looking for gpt-3.5-turbo (the model behind ChatGPT) or gpt-4, check out the OpenAI Chat Model Connector node.