Any GPT-series model would qualify. Any app using an LM-pretrained transformers for token generation would qualify, if most app interactions include queries to the model.

Currently I use Github copilot, but most interactions with my code editor do not involve copilot, so this does not qualify yet.

For context, I'd estimate I currently spend roughly 30-60 minutes per work week interacting with LM. I work on language model alignment as a PhD student. If I work on a project which requires intensive direct work with an LM on a temporary basis, this does not qualify. I will resolve this question taking an average over a one month period.