A bit more than half the size, it remains to be seen how powerful it is. There's clearly a non-linear relationship to model size, and it's also clear that it's hard to assess the power of these models anyway.
GPT-4 is unlikely to be 1.7T params. This is a number floating around in the internet with no justification.
The largest US open model is Google’s Switch-C which is 1.6T and only because it is a Mixture of experts model, i.e. it is constituted of many small models working together.