I have a feeling that the 39% served as a good framework for the LLM to work on the remaining part while keeping it consistent with the existing structure and style. So, in a sense, your 8 weeks are a big part of why it succeeded.
Yeah I've experienced that at work. I see a lot of comments on here saying you can't one shot features in real world software, but we do, and yes we still have a human review the code with a high bar.
But we've also spend a lot of effort over the past year and a half to make the codebase and tooling more approachable to LLMs so they know how we like to do things and follow our standards.
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This is how I’ve got very very good results from the latest models. If it can follow what I want and how I build, it does very well. If it can’t, it’s more likely to go off the rails and do something brittle or nonsense.