It depends on what kind of code you're working on and what tools you're using. There's a sliding scale of "well known language + coding patterns" combined with "useful coding tools that make it easy to leverage AI", where AI can predict what you're going to type, and also you can throw problems at the AI and it is capable of solving "bigger" problems.

Personally I've found that it struggles if you're using a language that is off the beaten path. The more content on the public internet that the model could have consumed, the better it will be.