Bloom is open source and free by huggingface. It's 700 gb though and requires a lot of RAM. There are reduced versions but they're less powerful. It might be less superior than GPT-3 Bloom isn't as good because they went with a huge model and not enough training data.

quick fyi on Parameters. They don't do everything, Dall-e 1 has more parameters than dall-2, but the latter is much better at it's tasks. The quality of training set, algorithm architecture, and other optimizations account for a great deal.