How many parameters does an LLM model have?

I am working through Generative AI for Everyone and Andrew talks about how to choose an AI Model and he gives different levels: 1B parameters for simple prompts, 10 b for more complex ones and 100B parameters for the most complex and real world queries. I have asked Claude (default on my browser) about Claude, Chat GPT and Gemini. The answer was that the parameters are not officially disclosed, but Claude did give some estimates , which are 100 - 1000 B parameters. How does one find out how many parameters are in a model and then go about selecting one. Or is suc_ it and see a reasonable approach?

There’s no single parameters—it ranges from millions, through billions, up to trillions.

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Parameters here is refers to how many weights an biases the model has, you cannot really select them! They are part of the model settings after it has been trained.