Main takeaway:

  Average cost per attempt, without → with RTK:
  
  Claude/Fable: $1.72 → $1.64 (~5% cheaper)
  DeepSeek: $0.115 → $0.121 (~5% more expensive)

  Almost all Claude savings came from a single task.
  Excluding it, savings were under 1%.

It took me a few rereads to parse out the top-line. This article really buries the lede.