alt Hacker NewsAnecdata but I’ve found Claude code with Opus 4.5 able to do many of my real tickets in real mid and large codebases at a large public startup. I’m at senior level (15+ years). It can browse and figure out the existing patterns better than some engineers on my team. It used a few rare features in the codebase that even I had forgotten about and was about to duplicate. To me it feels like a real step change from the previous models I’ve used which I found at best useless. It’s following style guides and existing patterns well, not just greenfield. Kind of impressive, kind of scary
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I'm seeing this as well. Not huge codebases but not tiny - 4 year old startup. I'm new there and it would have been impossible for me to deliver any value this soon. 12 years experience; this thing is definitely amazing. Combined with a human it can be phenomenal. It also helped me tons with lots of external tools, understand what data/marketing teams are doing and even providing pretty crucial insights to our leadership that Gemini have noticed. I wouldn't try to completely automate the humans out of the loop though just yet, but this tech for sure is gonna downsize team numbers (and at the same time - allow many new startups to come to life with little capital that eventually might grow and hire people. So unclear how this is gonna affect jobs.)
I've also found it to keep such a constrained context window (on large codebases), that it writes a secondary block of code that already had a solution in a different area of the same file.
Nothing I do seems to fix that in its initial code writing steps. Only after it finishes, when I've asked it to go back and rewrite the changes, this time making only 2 or 3 lines of code, does it magically (or finally) find the other implementation and reuse it.
It's freakin incredible at tracing through code and figuring it out. I <3 Opus. However, it's still quite far from any kind of set-and-forget-it.
Same anecdote for me (except I'm +/- 40 years experience). I consider my self a pretty good dev for non-web dev (GPU's, assembly, optimisation,...) and my conclusion is the same as you: impressive and scary. If the somehow the idea of what you want to do is on the web in text or in code, then Claude most likely has it. And its ability to understand my own codebases is just crazy (at my age, memory is declining and having Claude to help is just waow). Of course it fails some times, of course it need direction, but the thing it produces is really good.