“We think that AI represents a rare, once-a-decade opportunity to rethink what a browser can be about,” OpenAI CEO Sam Altman said during a livestream of the company’s announcement on Tuesday.

Microsoft has rolled out a major upgrade to its Edge browser, introducing an enhanced “Copilot Mode” that effectively turns Edge into an AI-powered browser.

Atlas is free to download on macOS, but its full automation and “Agent Mode” features are tied to ChatGPT Plus, Pro, or Business plans, ranging from approximately $20 to $60 per month, depending on t...