Tutorials, deep dives and product notes — built for developers.
AI-generated unit tests are correct only 12.69% of the time on complex real-world functions — but 85%+ with sandbox execution and self-repair. Research on why model selection matters, how execution-guided generation works, and when to write tests yourself.
Every AI model claims a 1M-token context window. But only GPT-5.5 and Claude Opus 4.6 actually use it. We analyzed MRCR v2, NIAH-2, and Graphwalks to show the 60-point gap between the best and worst "1M-capable" models — and which one to trust for long-context coding.