GPT API Companion is a Chrome extension that allows users to summarize web pages using the GPT API and ask questions about the content. This extension requires users to generate their own Open AI API key, which can be obtained from the OpenAI platform. It's important to note that using the GPT API may incur costs.

Versionof GPT API Companion introduces support for GPT3.5 with a 16K token size, allowing for better contexts in summarization. Previous versions have also included bug fixes and improvements, such as separating options into their own page and adding end-to-end encryption for chat history. The extension also supports GPT-4 and includes a spinner animation.

Overall, GPT API Companion is a useful tool for summarizing web pages and interacting with the GPT API. It provides a seamless experience for users who want to extract key information from online content.