How to use an own fine-tuned model in customGPT?

What is the way to use/link/access a GPT model I tuned on my own in an own customGPT? Is there any way to setup and access the model ID by customGPT?

This is currently not possible and not a feature OpenAI is planning to add.

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You can create a custom action to connect with your fine-tuned model via the API as usual.
The major part of the task will then be to properly instruct the GPT what to send as message and how to process the return.

What @N2U was referring to is that you cannot instantiate the custom GPT with your fine-tuned model to be the one and only model used. Instead you will have to use the version OpenAI provides for the custom GPTs at any point in time and connect it via a custom action.

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