Fable usage falling off a cliff because it was generally worse than Opus 5.5 at a lot of SWE tasks. People were still using fable 5.1 > opus 5 a lot, especially in orgs that have infinite or basically-infinite usage limits (e.g. Cloudflare[0]), until Opus 5.5 came out. Medium Opus is pretty token efficient with XHigh being really good for things fable used to be ideal for (e.g. reasoning / architecting projects). 5.2 sounds like it'll be once again the best for intuition-dependent tasks.

0: https://x.com/tanayj/status/2118047122939658341

  Cloudflare doesn't have token leaderboards or limits, but uses alerts for token spend management:
  
  - $300 in a day: that employee gets an email
  - $500: manager gets an email
  - $1,000: VP gets an email
  
  (via CTO @dok2001 on No Priors)