OpenAI says nearly all its employees have switched from chatbots to Codex agents, but every number comes from OpenAI itself

TL;DR

OpenAI says 98% of employees now use Codex agents and non-dev usage grew 137x, but all metrics are self-reported by the company that sells the product.

Nearly 98 percent of OpenAI’s employees now use Codex, the company’s AI coding agent, up from roughly 40 percent in August 2025, according to a paper the company published on Wednesday titled “The Shift to Agentic AI: Evidence from Codex.” The paper describes a fundamental change in how the company’s own workforce interacts with AI, moving from conversational chatbot use to autonomous agents that execute multi-step tasks. Every statistic in the paper, however, comes from OpenAI itself, a company with a direct financial incentive to promote the product it is measuring.

The headline numbers are striking. Active Codex users grew fivefold in the first half of 2026, and requests for tasks estimated to take eight or more hours increased nearly...

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