Browser Wars 2.0: Atlas makes the browser the agent runtime
OpenAI’s October 21, 2025 launch of ChatGPT Atlas and its Agent Mode preview marks a platform shift. The browser is becoming where agents work, reshaping search, SEO, ads, and developer roadmaps.

The moment the web changed course
OpenAI launched Atlas and Agent Mode, redefining how the browser can act as a runtime for agents. The browser becomes the workspace for an assistant that can act inside web pages. The article outlines a 90-day playbook for making sites agent-friendly, including consent flows, safety, and governance. It also discusses risk, trust, and the broader implications for Chrome and the web economy.








