Not a secret but still pretty cool. https://www.theverge.com/2024/4/1/24118007/openai-chatgpt-free-no-account-login
this post was submitted on 17 Jul 2024
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DuckDuckGo offers the same (and use of a couple other AI models), except the AI doesn't train from your use:
https://duckduckgo.com/?q=DuckDuckGo+AI+Chat&ia=chat&duckai=1