No, you can’t use the chatgpt without an account.
You have to visit this link: https://chat.openai.com/auth/login and create an account using Google Account, Microsoft Account and Apple Account.
Once you choose any one option, you have to verify the account using mobile number.
Upon verification you can use the ChatGpt for free and create awesome content like blog post, essay, book etc.
You can also access the ChatGPT Plus with same account by paying a monthly subscription of $20.