Is it possible to set a custom fine-tuned model?

[yuwangi]

If possible, how to set it up?

https://openai.com/pricing

[waylaidwanderer]

As per the readme and the example settings.json:

        modelOptions: {
            // You can override the model name and any other parameters here.
            // The default model is `gpt-3.5-turbo`.
            model: 'gpt-3.5-turbo',
            // Set max_tokens here to override the default max_tokens of 1000 for the completion.
            // max_tokens: 1000,
        },

You can override the model name and any other parameters here.