DeepSeek it’s actually free, you do have to pay for their API.
You can host it locally for free, if you have the resources to run the models.
They have several available, however the one that completes with OpenAIs model requires about 300GB of ram and the fastest and greatest CPU and graphics cards that are on the market to run at the speed ChatGPT runs at.
There currently is a thread open in Ideas for adding local AI models to Bootstrap Studio. You’d be better posting there, or adding to the thread if you are interested.