Using the ChatGPT API

ChatGPT does not have a "set" number of languages it supports due to the nature of LLMs. By default, because LLMs are trained on a massive dataset, there is no telling how many languages are included in this dataset or how well ChatGPT supports one language over another. From my limited testing, it seems to be the best in its class for understanding emotion/tone. It also has the unique ability to have a custom prompt, meaning that you can tweak the way it responds very easily. It also supports multiple languages in the same message.

Pricing for ChatGPT is available here: https://openai.com/api/pricing/. It seems to be very reasonable given its functionality. If you want to save even more $, you can try using the mini models such as 4o-mini. This may come at the cost of noticeable quality downgrades for each translation.