As of 2025, the Best Coding AI
As of 2025 (at least as of August), by far the best coding AI is Gemini's 2.5 Pro (Flash is still good). It can create much more complex and long codes, such as games, without messing up or shortening the code. Although it starts to struggle around 2,000 lines, I foresee that the next Gemini model will have even stronger coding capabilities. Gemini 2.0 was terrible at coding (and many other things), but with canvas enabled, Gemini 2.5 is a coding machine. Of course, it excels at JavaScript and HTML games most, but that doesn't mean it is bad. It can make very complex and original games, especially if you supply guidance and images.