Comment by Uehreka

> (e.g. implement a well documented wire protocol with several reference implementations on a microcontroller)

I have had an AI assistant reverse engineer a complex TCP protocol (3-simultaneous connections each with a different purpose, all binary stuff) from a bunch of PCAPs and then build a working Python server to speak that protocol to a 20-year-old Windows XP client. Granted, it took two tries: Claude Opus 4.1 (this was late September) was almost up to the task, but kept making small mistakes in its implementation that were getting annoying. So I started fresh with Codex CLI and GPT-5.1-Codex had a working version in a couple hours. Model and tool quality can have a huge impact on this stuff.