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Re:Exploring GPTs: ChatGPT in a trench coat? by freedomben on Wednesday November 15, 2023 @12:02PM (#38279063)
It's not a different model, it's just a customized system prompt. It costs basically nothing extra for them to run. Actual fine-tuning is $$$
Re:Exploring GPTs: ChatGPT in a trench coat? by spdustin on Wednesday November 15, 2023 @01:32PM (#38280433)
Technically, it is (it’s gpt-4-gizmo). There’s a chance that had some fine-tuning for understanding the presence of the just-in-time function calls for actions.

(Names for Actions in Custom GPTs are tagged with “jit”)