It's the best API searcher for APIs which are used a lot. If you want do anything other than the most common thing it can be worse than useless. (I've been running into this in a project where I'm using Svelte 5, and the language models are only interested in telling me about/writing Svelte 4, and transformers.js, where they tend to veer off towards tensorflow.js instead. This despite me explicitly mentioning what version/library I'm using and the existing code being written for said version.)

Anyways, they can definitely be very useful, but they also have a golden path/winning team/wheel rut effect as well which is not always desirable.