I spend a lot of time reviewing any code that comes out of Claude Code. Even using Opus 4.6 with max effort there is almost always something that needs to be changed, often dramatically.

I can see how people go down the path of thinking "Wow, this code compiles and passes my tests! Ship it!" and start handing trust over to Opus, but I've already seen what this turns into 6 months down the road: Projects get mired down in so much complexity and LLM spaghetti that the codebase becomes fragile. Everyone is sidetracked restructuring messy code from the past, then fighting bugs that appear in the change.

I can believe some of the more recent studies showing LLMs can accelerate work by circa 20% (1.2X) because that's on the same order of magnitude that I and others are seeing with careful use.

When someone comes out and claims 10X more output, I simply cannot believe they're doing careful engineering work instead of just shipping the output after a cursory glance.