Author(s): Sarath Krishna Prasad
Originally published on Towards AI.
Opus 5 vs Fable 5: Near-frontier performance at half the cost
A developer’s look at where Anthropic’s new “everyday” model actually beats the flagship, and where Fable 5 is still worth double the price.
When Anthropic shipped Claude Fable 5 in June, the reaction in most engineering Slack channels I’m in was a mix of awe and sticker shock. The model was clearly the smartest thing you could hit over an API and it ate token budgets like a runaway cron job. Teams complained loudly about its burn rate: long agentic runs that blew through allotments, bills that spiked mid-sprint, and finance people asking why the “AI line item” doubled.
