OpenAI is shutting down ChatGPT Atlas, a browser launched on October 20, 2025, with the product ending on August 8, 2026. Atlas was a browser with ChatGPT built in, offering features like a ChatGPT sidebar, agent mode for multi-step tasks, browser memory, and inline writing help. OpenAI never published usage numbers for Atlas, but a ten-month shutdown suggests adoption fell short. Instead of disappearing, agent mode, memory, and the writing tools are moving into the ChatGPT desktop app and a fresh Chrome extension. According to OpenAI, agent mode and the writing tools are moving to the Chrome extension, allowing users to access similar features without a separate browser. Every feature Atlas had is landing inside ChatGPT, making the app more useful but also creating lock-in, as search, writing help, and memory all reside there.