The rumor is that 3.9 is an equal improvement in all directions, and that it should be another fast follow on like 3.7 and 3.8 were.

It's almost across the board better than Terra at less than half the price. 3.9 is likely to approach Sol at the 1/10th the price.

Hopefully OpenAI releases Astra first, and it's not only better than Sol but significantly cheaper, too.