Early this morning.OpenAI has officially announced the immediate availability of ChatGPT without the need to register for an account.
Currently, the version that can be used directly without registration is GPT-3.5, and the registration-free version of the registered version of ChatGPT introduces additional content safeguards, such as blocking prompts and generation in a wider range of categories. GPT-4.0 still requires an account to be registered and paid for.
Although GPT-3.5 can be used without registration, the registered version offers more services than the registered version, such as saving and viewing chat logs, sharing conversations, and other features including voice conversations and custom commands.