The headline price did not move, and the bill fell by a quarter
2026-09-10AI
Claude Fable 5.1 costs exactly what Fable 5 cost per token: 10 dollars in, 50 dollars out. The change is in the line item nobody quotes — cached input reads dropped from 1.00 to 0.25 per million. On agentic workloads, that is most of the input bill.