Wow the sentiment here is so negative. I'm on the $200 plan (work pays) and I also have the $20 OpenAI plan (I pay) and keep a balance on OpenRouter. There is nothing as good as Fable, not even close. I recently had it run a 18 hour autonomous rebuild of a project (moving from Spark to Pandas for performance/data size trade off issues). It orchestrated Opus sub-agents flawlessly for 18 hours. It even did a great job…
I like this story. How did you verify the output? How big is the codebase? Why it took 18 hours? Could you implement it with a small local agent and breaking the task down yourself in two days (i know it sounds like a loaded question, it is not). I think the rewrites are the main story for llms in code (hot take). Writing greenfield code at the seams also something which might work well.
It's a fairly large code base split across 3 repos.
The good thing was that it is fairly easy to verify: we have a working (but slow) version that uses Spark, with lots of existing unit tests.
We verified by using those unit tests as well as running our end-to-end process in the Spark and Pandas version and verifying the two databases were within the differential-privacy noise bands of each other.