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> There is so much opportunity for purpose built models like this.

OpenAI etc could themselves do this, and maybe they already do? Where the public-facing interface delegates to multiple little goblins behinds the scenes

Exactly. There could be a lot of value for inference companies to do this. Could save a lot of money being able to hand off highly repetitive known tasks to far smaller specialized models.
castform founder here. openai actually deprecated their finetuning apis a few months back weirdly.