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OpenAI announced reusable cloud development environments for Codex and launched related tooling at Dev Day Feature update
The daily briefing
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TLDRocket
29 September 2026
The day’s main thread is OpenAI turning “agent” from a buzzword into a product stack—inside ChatGPT, across plugins, and down into developer tooling. At Dev Day in San Francisco, it launched Dots, an always-on personal agent powered by GPT-6 Astra, rolling out to ChatGPT Pro and Business Premium users in eligible markets. Dots aims to pursue user-defined goals in the background, with team and Slack/Teams options and Microsoft’s Agent 365 security integration. In the same keynote orbit, OpenAI expanded ChatGPT plugins into app-like extensions with dedicated sidebar homes, interactive panels, file viewers, and support for MCP Events so automations can trigger from app actions.
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