OpenRouter is a unified interface for LLMs which helps you find the best models and prices. Some models are even free.
To use OpenRouter, you'll need to in the API key filed in the Addon
Go to https://openrouter.ai/ and signup for an account
Once you have an accoutn create an API key to use with Sheet Workflows and save the key in the input field of the OPen Router Provider.
WHen you open an account with Open Router, you get a few credits, afther which you will have to buy additional credits (In Open Router) to use any of the paid models.
10 months ago