A coworker tried to use it with a well-established Python library and it responded with a solution involving a Class that did not exist.

LLMs can be useful tools but, be careful in trusting them too much - they are great at what I’d say is best described as “bullshitting”. It’s not even “trust but verify” it’s more “be skeptical of anything that it says”. I’d encourage you to actually read the docs, especially those for libraries as it will give you a deeper understanding of what’s actually happening and make debugging and innovating easier.