OpenAI says Codex tops 5 million weekly users, up 6x

OpenAI Codex Reaches 5 Million Users as It Expands Beyond Coding

OpenAI on Tuesday published a report titled “The Next Era of Knowledge Work,” revealing that its Codex agent now has more than 5 million weekly active users — a more than sixfold increase since the desktop app launched in February. The milestone underscores how a tool originally built for software development is rapidly becoming a general-purpose productivity platform.openai

Knowledge Workers Driving Growth

While developers remain the largest user group, knowledge workers now account for roughly 20 percent of Codex’s user base and are growing more than three times as fast as developers, according to the report. The fastest-growing tasks among these non-technical users are data analysis, research, and the creation of “knowledge artifacts” such as reports, spreadsheets, and presentations.constellationr

OpenAI said these users “primarily use Codex to create reports, spreadsheets, presentations, contracts, and other work products” and are “increasingly using it for research, data analysis, workflow automation, and building lightweight tools that previously required engineering support”. Users are also running multiple Codex tasks in parallel, allowing them to investigate data, draft materials, and automate workflows simultaneously.openai

From Coding Agent to Computer Agent

The expansion follows a series of product updates that broadened Codex’s capabilities well beyond code generation. In February, OpenAI introduced GPT-5.3-Codex, which the company described as enabling Codex to do “nearly anything developers and professionals can do on a computer”. In April, OpenAI released GPT-5.5 with further improvements in documents, spreadsheets, and computer use. A Chrome extension launched in May gave Codex access to authenticated browser sessions where most daily work takes place.eigent

Competitive Context

The report also arrives as OpenAI faces intensifying competition in the agentic AI space. Constellation Research analyst Holger Mueller noted the report’s strategic timing, writing that “the purpose of the OpenAI report is to reclaim some buzz for Codex vs. Anthropic’s Claude franchise, notably Claude Cowork”. With product managers, researchers, designers, and executives now among its growing user segments, Codex’s trajectory illustrates how AI coding tools are evolving into broader workplace agents — and how the race to dominate that category is accelerating.constellationr