I cloned the Auto-GPT repo and added my OpenAI key to .env. Didn't see any setting to choose the model in the example env file. FWIW, I do have both 3.5 and 4 as a Plus customer but I can't say for sure which model AutoGPT uses.

After posting this comment, I revisited AutoGPT's Github. They now say `master` is always broken and I should clone `stable`.

I had originally cloned `master` about 10 days ago.