ChatGPT offers a permanent Free plan for all users with basic access....

https://jaspersmasterinsights.opalvector.com/posts/i-keep-searching-for-chatgpt-plus-trial-codes-what-should-i-do-instead

ChatGPT offers a permanent Free plan for all users with basic access. Occasionally, targeted promotions provide a free trial of the Plus plan, which may require a card and auto-renews unless canceled