Mixed
the impact in velocity is between 10% and -25%
orwin on Hacker News
impact on code production is like 80-100%
In the thread “Ask HN: By what percentage has AI changed your output as a software engineer?”
Helped: Increased code production volume significantly.
Got in the way: Production bugs, security holes, and poor model definitions.
… With Opus4.5, Gemini 3 and gpt 5.2, it's now 20%, maybe 50% if we only talk about personal code output. If we talk about my whole team output, I'd say the impact on code production is like 80-100%, but the impact in velocity is between 10% and -25%. So many bug in production, security holes, so many poor models definition making it to production DB only for me and the other true senior to have to fix it. …