In order to use IBM watsonx.ai models, you'll need to create an IBM watsonx.ai account and obtain an API key. After successfully authenticating using the IBM watsonx.ai Authenticator node, you can select a Large Language Model (LLM) from a predefined list.
Refer to the IBM watsonx.ai documentation for more information on available chat models. At the moment, only the chat models from foundation models are supported. Refer to Choosing a model page for more information on chat models that support tool calls.
Note : If you want to use a space, make sure that the space has a valid runtime service instance. You can check this at IBM watsonx.ai Studio under Manage tab in your space.