The listed ChatGPT Plus price is $20 per month, but actual costs can vary from...

https://dibz.me/blog/is-there-a-chatgpt-plus-free-trial-i-can-click-to-start-1223

The listed ChatGPT Plus price is $20 per month, but actual costs can vary from $13 to $27. Differences come from factors like taxes (VAT or GST) and extra fees added by app stores