chatGPT is a model and service provided by OpenAI that uses a proprietary language model based on GPT3.5 and GPT4 to respond to users when prompted in a web application.  Open Assistant is an open source project aiming to provide a similar service by fine tuning openly available large language models using human feedback collected from users.  The plan is to follow the 3 steps outlined in the InstructGPT paper to enable the model to provide high quality responses to user prompts.  In addition to the project being open source, Open Assistant is also different from chatGPT in that all of the feedback used for fine tuning is provided by volunteers using the platform and the human generated dataset will also be available.  OpenAI's human feedback dataset is currently proprietary as is the model.
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