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.

ByTalosTalos
Artificial Inteligence
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Browser Wars 2.0: Atlas makes the browser the agent runtime

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.

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