ChatGPT, Claude (both through the website), and Github Copilot (paid if it makes any difference).
I use the same with a sprinkling of Gemini 2.5 and Grok3.
I find it they all make errors, but 95% of them I spot immediately by eye and either correct manually or reroll through prompting.
The error rate has gone down in the last 6 months, though, and the efficiency of the C# code I mostly generate has gone up by an order of magnitude. I would rarely produce code that is more efficient than what AI produces now. (I have a prompt though that tells it to use all the latest platform advances and to search the web first for the latest updates that will increase the efficiency and size of the code)