Saving tokens
Every answer re-reads the whole conversation. Saving tokens is not saying less, it is not making it re-read what no longer serves.
The context window
A box with a fixed volume, never empty when you arrive. Nothing you put in it leaves, until it is full. Choose what is in the box, and where.
Confidentiality
Once it is sent, it is out of your hands. Where a prompt goes, five ways it leaks, and eight reflexes. Decide before you paste: which door, and which words.
Which Claude
Four models, and a second dial almost nobody knows about. The model sets the rate, the effort sets how long the meter runs. One, two, five, ten — and they multiply.