How credits work
A credit is one 64×64 sprite. Bigger images count by area: 64×128 is two, 128×128 is four, a full 1024×1024 sheet is 256. Studio shows the price before anything is sent.
Trying every model on the same sprite is free for ten minutes after the first run. The strength slider and downloads never cost anything.
Subscriptions reset to the plan's allowance each month; unused credits don't carry over. See the terms.