Update README.md

Author: D1M1TR10S

README.md

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 # @models Copilot Extension
 
-This is a [GitHub Copilot Extension](https://docs.github.com/en/copilot/using-github-copilot/using-extensions-to-integrate-external-tools-with-copilot-chat) that provides a way to interact with [GitHub Models](https://github.blog/news-insights/product-news/introducing-github-models/), directly in Copilot Chat.
+This is an agent-based [GitHub Copilot Extension](https://docs.github.com/en/copilot/using-github-copilot/using-extensions-to-integrate-external-tools-with-copilot-chat) that provides a way to interact with [GitHub Models](https://github.blog/news-insights/product-news/introducing-github-models/), directly in Copilot Chat.
 
 >[!NOTE]
-> Copilot Extensions are in public beta and GitHub Models are in limited public beta. They may be subject to change. To request access to GitHub Models, [join the waitlist](https://github.com/marketplace/models/waitlist).
+> Copilot Extensions are in public preview and GitHub Models are in limited public preview. They may be subject to change. To request access to GitHub Models, [join the waitlist](https://github.com/marketplace/models/waitlist).
 
 ## What it can do