Working
How the monthly savings estimate is calculated
The math behind the cost calculator, and what it currently assumes.
List pricing
Model
Input
Output
Hal 1.0
$2.25 / MTok
$13.75 / MTok
Claude Opus 5.5
$4.00 / MTok
$20.00 / MTok
Formula
moved = monthly_spend × (share_moved ÷ 100)
savings = moved × (1 − rate_ratio)
new_bill = monthly_spend − savings
annual = savings × 12