best open models from recent releases for math research?

I know models from OpenAI are probably the best for math research, but given the recent accusations against OpenAI that research work could be used to train their own models, the lack of transparency makes me consider moving to local models. Does anyone have good experience with the recent open model releases (especially flash models that I can run on my 2x spark cluster) when it comes to doing math research? Or techniques that work well with these open sources models in this particular setting? Thanks in advance for helpful advice.