The listed ChatGPT Plus price is $20, but the actual cost often varies between...

https://wiki-aero.win/index.php/What_Is_the_Max_File_Size_for_ChatGPT_Plus_Uploads%3F_A_Deep_Dive

The listed ChatGPT Plus price is $20, but the actual cost often varies between $13 and $27. This difference comes from factors like local taxes such as VAT or GST, and extra fees applied by app stores on iOS or Android