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Thanks for the reply. I already know how to create a parameter and use this value in a .model statement of transistor / diode etc, which is what you have shown, but unfortunately this doesn't help with my question.

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Is there a way to access a value defined in the .model statement of a transistor etc, and then use that value elsewhere in an expression?

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Is there some syntax like: "getvalue(npnmodel, is)", or "npnmodel.is", or something similar to grab the already defined value out of a .model statement?

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I scoured the LTSpice docos / online resources but and can't find anything like this, so I am guessing the answer is no, but I thought I'd ask here for an more official "no". I can workaround it in other ways, but having this sort of access would be really useful to prevent a bunch of manual text editing every time I want to try out a different model and calculate derived expressions from it.

I think your guess is correct. This isn't an "official "no". But since the Gummel-Poon model, for example, is public domain, it would in principle be possible to derive it from the actual characteristics. There is another issue: in most models, some of the parameters are not stated, so remain at their default value, which is often zero, but not always. Therefore they couldn't be extracted from the .model. I don't know for sure, but it's also possible that not all simulators have the same default values. I would think this is enough to deter you from this route, and probably why such a reverse look-up doesn't exist.

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Regards,
Tony