I think the most advanced OpenSource LLM model right now is considered to be Mistral 7B Open Orca. You can serve it via the Oobabooga GUI (which let’s you try other LLM models as well). If you don’t have a GPU for interference, this will be nothing like the ChatGPT experience though but much slower.

https://github.com/oobabooga/text-generation-webui

You can also try these models on your desktop using GPT4all, which doesn’t support GPU ATM.

https://gpt4all.io/index.html