Codex from 0 to 10M Users: Building ChatGPT Work

ChatGPT Work is an AI-powered productivity platform developed by OpenAI that brings advanced agent capabilities to knowledge workers, expanding beyond traditional software engineers. The platform combines chat functionality with a shared agent harness that allows users to work across various primitives like documents, spreadsheets, and interactive websites. Rather than manually operating individual software applications, users simply describe a desired outcome, and the AI agent assembles the necessary tools, context, and artifacts to complete the task.

The development of ChatGPT Work stems from the unexpected adoption of OpenAI's Codex coding tool by non-developers inside the company, such as marketing and finance employees who used it for day-to-day tasks. This revealed a massive demand for AI leverage among people who do not write code. In response, OpenAI integrated its agent experiences into a consolidated superapp approach. While Codex and ChatGPT Work share the same underlying agent harness, they feature different user interface options tailored to specific needs, such as exposed Git visibility and file diffs for technical users, versus simpler interfaces for knowledge workers.

This product launch reflects a broader industry shift where AI is blurring the lines between engineering, design, strategy, and operations. As agents take on tasks like financial planning, automated research, and content creation, the main bottlenecks are shifting toward human taste and original ideas rather than technical execution.