pip install transformers[agents]
To use openAI models, you instantiate an [OpenAiAgent] after installing the openai dependency:

pip install openai

from transformers import OpenAiAgent
agent = OpenAiAgent(model="text-davinci-003", api_key="")

To use BigCode or OpenAssistant, start by logging in to have access to the Inference API:

from huggingface_hub import login
login("")

Then, instantiate the agent

from transformers import HfAgent
Starcoder
agent = HfAgent("https://api-inference.huggingface.co/models/bigcode/starcoder")
StarcoderBase
agent = HfAgent("https://api-inference.huggingface.co/models/bigcode/starcoderbase")
OpenAssistant
agent = HfAgent(url_endpoint="https://api-inference.huggingface.co/models/OpenAssistant/oasst-sft-4-pythia-12b-epoch-3.5")

This is using the inference API that Hugging Face provides for free at the moment.