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What is a key, and what does it cost?
A key lets this page talk to your AI for you. You make it on the AI company’s own site with “Get a key”, then paste it here once. Each company charges for its use directly to you, usually a few cents per question; TheoreticalPhysics.ai charges nothing for it. A monthly chat plan such as ChatGPT Plus or SuperGrok is separate from a key; if that is what you have, you do not need a key: use the add-on above. A key is an extra, never required. Under 18? Ask a parent or your school; AI companies have age rules for keys.
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