It's not clear what evidence you expect to see? Every major tech company is using AI for a significant % of their code. Ask anyone that works there and you will have all the evidence you need.

> Every major tech company is using AI for a significant % of their code

It shows, increased outages, increased vulnerabilities, windows failing to boot, windows task bar is still react native and barely works. And I have spoken to engineers at FANG companies, they are forced to use LLMs, managers are literally tracking metrics. So where is all this amazing new software and software quality or increased productivity from them?