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Your own model
Without a key, Causius reads letters with free shared models. They have a small daily budget that every visitor draws on, and they are not the strongest available.
A legal letter deserves the best reading you can give it. Connect an API key from a provider below and your analyses run on the strongest model that key can use, on your own budget. The key is kept in this browser only: it is sent with each analysis to reach your provider and is never stored by Causius.
Use an API key, ideally one with a spending cap. Causius never asks for a subscription login such as Claude Pro or ChatGPT Plus.