None of those models are Fable's class. There are definitely many cheaper options for LLM agents, but people are paying attention to Fable for a reason.
People are also paying attention to open models for a reason, they are around 6-9 months behind and far cheaper. Fable output looks like a modest improvement, certainly not 2x like the price. We'll have similar models we can run ourselves by this time next year
No point if one can't use Anthropic's models.