On August 9, 2026, OpenAI officially shut down ChatGPT Atlas, its AI-native browser, just 292 days after launch. The product, once hailed as a "Chrome killer," only ever shipped a macOS version. In October 2025, when OpenAI unveiled Atlas, it had 800 million weekly active users. The final instruction in OpenAI's help documentation told users to export their bookmarks as an HTML file before August 9. Atlas's shutdown is not isolated: over the past year, Arc halted development, Sidekick shut down, and The Browser Company sold itself to Atlassian for $610 million (~4.1 billion yuan). Chrome's global market share remained steady at roughly two-thirds, with fluctuations over the past year never exceeding two percentage points. Surviving AI browsers like Perplexity Comet, Opera Neon, and Dia generate no revenue from the browser itself, functioning instead as user acquisition tools or pieces of a larger business puzzle. In its shutdown notice, OpenAI conceded that an AI browser should be a feature, not a destination, signaling the failure of an entire product strategy as the battle for the AI entry point shifts from the browser shell to the agent arena.