In a frontier scientific research environment, funding is often limited, so personal subscriptions are more common. Fable can hit a 5-hour usage limit on the Max subscription tier before it finishes a single complex math prompt. Most of the time you get one or two if you reduce context and question complexity. Most of my colleagues are cancelling their subscriptions because of that, and just using Sol instead, which is virtually unlimited on the Pro tier.
Hmm. Would you mind sharing an example of a complex math prompt that you would use? Because I found that even Sonnet can solve fairly complex math problems fairly easily if you give it the right tools, so I'd like to give it a shot myself if you'd like.