Reality Check: How Much AI-Generated Code Is Actually Used in Production

Every day I see posts where people claim they barely code anymore or that in a few months most production code will be vibe-coded. Not only on dev.to, but also on Reddit, X and LinkedIn. My experience looks very different. In hobby projects, maybe 75% of my code is AI-generated. At work, I am still coding a lot, I think that there is like 25% code generated by AI. Don’t get me wrong, AI has definitely changed how I work. Whether it’s a hobby project or a sprint at the office, my workflow isn't the same as it was a year ago. However, many of the current predictions still feel heavily 'AI-hyped' compared to the boots-on-the-ground reality of software engineering. The difference becomes especially clear when comparing legacy systems with modern codebases. Older Codebases We maintain several older solutions built on .NET Framework. Honestly, some parts are a mess. I’ve cursed the original authors many times. In these systems, I rarely use AI for new features because it simply isn’t very he