With this release the underlying OpenAI model, that is used for classifying, is changed from text-davinci-003 to gpt-3.5-turbo-instruct.
This needs to be done because gpt-3.5-turbo-instruct is deprecated and will be disabled on January 4th 2024.
With the new model has different pricing which you can check on this page: https://openai.com/pricing