OpenAI has something like this as well (https://openai.com/index/introducing-gpts/ https://openai.com/index/introducing-gpts/), but both services only let you f

OpenAI has something like this as well (https://openai.com/index/introducing-gpts/ https://openai.com/index/introducing-gpts/), but both services only let you fine tune their models, not your own. And you aren't going to be able to see the weights.