ChatGPT Plus is listed at $20 per month, but your actual cost varies by country...

https://stateofseo.com/how-much-is-chatgpt-plus-in-japan-%c2%a53000-and-does-it-bill-in-yen/

ChatGPT Plus is listed at $20 per month, but your actual cost varies by country and device. Taxes like VAT or GST apply depending on where you live. If you subscribe through an app store, expect extra fees added on top