You are asking what the differences are between ChatGPT and Open Assistant.

ChatGPT is a large language model made by Open-AI. It is built on a closed model and is a closed source. Open Assistant is a large language model (LLM)  that is open-sourced and trained on a model that can be viewed and contributed to by everyone. 

The system requirements for ChatGPT are such that only large corporations and entities like universities can build their own. Open Assistant is being developed so that versions can run on personal/home hardware.

ChatGPT is currently free to use but Open-AI has already introduced a paid tier for users. Open Assistant is a free-to-use LLM that can be downloaded and locally hosted for free.
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